Single-Leg RDL (Dumbbell)
The balance and strength convergence — where posterior chain power meets stability demand, revealing asymmetries and forging athletic resilience one leg at a time
⚡ Quick Reference
| Aspect | Details |
|---|---|
| Pattern | Hip Hinge (Unilateral) |
| Primary Muscles | Hamstrings, Glutes |
| Secondary Muscles | Erector Spinae, Hip Stabilizers, Core |
| Equipment | Dumbbell, Kettlebell |
| Difficulty | ⭐⭐⭐ Advanced |
| Priority | 🟡 Recommended |
Movement Summary
🎯 Setup
Starting Position
- Weight selection: 30-50% of bilateral RDL weight
- Beginner (to movement): 10-25 lbs
- Intermediate: 25-45 lbs
- Advanced: 45-70 lbs (balance becomes limiting factor)
- Equipment choice:
- Single dumbbell: Most common, versatile
- Two dumbbells: More load, easier to balance
- Kettlebell: Good alternative, compact
- Standing leg (working leg): Foot flat, toes forward or slightly out
- Slight knee bend (10-20°) locked in place
- Weight distributed mid-foot to heel
- Free leg (non-working): Starts slightly behind body
- Will extend backward as you hinge
- Stays roughly in line with torso
- Dumbbell position:
- Contralateral (opposite side): Dumbbell in opposite hand from standing leg (MORE challenging for balance)
- Ipsilateral (same side): Dumbbell in same hand as standing leg (LESS challenging)
- Recommendation: Start ipsilateral, progress to contralateral
- Posture: Chest up, shoulders back, core braced
Equipment Setup
| Equipment | Setting | Notes |
|---|---|---|
| Dumbbell | 30-50% of bilateral RDL | Balance is the limiting factor, not strength |
| Kettlebell | 25-50 lbs typical | Alternative to dumbbell |
| Support (optional) | Hand on wall/rack | For learning or balance-challenged |
| Mirror | Lateral and frontal view | Check alignment and level hips |
"Imagine you're a flamingo about to bow — one leg planted, ready to extend the other back as you tip forward, everything moving as one solid unit"
Grip Variations Explained
Contralateral (opposite hand):
- Dumbbell in LEFT hand, standing on RIGHT leg (or vice versa)
- HARDER — creates rotational force you must resist
- Better for anti-rotation core strength
- Most athletic, functional
Ipsilateral (same hand):
- Dumbbell in RIGHT hand, standing on RIGHT leg (or vice versa)
- EASIER — less rotational demand
- Better for learning the movement
- Good for pure hamstring/glute focus
Dual dumbbell:
- Dumbbell in each hand
- EASIEST to balance
- Can use more total weight
- Less core stabilization demand
🔄 Execution
The Movement
- 🔝 Starting Position
- ⬇️ Lowering (Hinge + Leg Extension)
- ⏸️ Bottom Position
- ⬆️ Rising (Hip Extension)
What's happening: Establishing single-leg balance before movement
- Standing on one leg, other leg slightly behind
- Standing knee soft (10-20° bend), locked in position
- Dumbbell at thigh level (one or both hands)
- Hips level, shoulders square
- Core braced hard — this is a stability exercise
- Breathing: Deep breath, brace
Feel: Subtle activation in standing foot, ankle, and hip stabilizers
Balance checkpoint: Should feel stable here before attempting the hinge
Mental cue: "Root down through standing foot like a tree"
What's happening: Simultaneous hip hinge and leg extension creating "T" position
- Push standing hip BACK (initiate the hinge)
- Free leg extends straight back as counterbalance
- Torso leans forward, staying rigid and neutral
- Dumbbell lowers toward ground (stays close to standing leg)
- Continue until torso is parallel to floor (or flexibility limit)
- Free leg, torso, and arms form straight line (T-position)
- Standing knee stays at same angle (doesn't bend more)
- Breathing: Hold breath or controlled exhale
Tempo: 2-3 seconds (slow, deliberate, controlled)
Feel: Intense stretch in standing hamstring, glute loading, core working hard to prevent rotation
Critical alignment cues:
- Hips stay LEVEL (don't let free leg hip hike up)
- Shoulders stay SQUARE (don't rotate toward standing leg)
- Free leg in line with torso (not off to side)
Common depth: Torso parallel to floor, free leg extends straight back at same height
Balance note: If wobbling excessively, slow down or reduce weight
What's happening: Peak hamstring stretch, maximum stability demand
- Torso parallel (or near parallel) to floor
- Free leg extended straight back, forming line with torso
- Standing hamstring at maximum stretch
- Hips level — not rotated
- Shoulders square — not twisted
- Dumbbell near floor (or at shin height)
- Standing foot stable, not rolling
Visualization: Your body forms a capital "T" from the side
Quality checks:
- Someone standing in front should see level hips
- Someone from side should see straight line: free leg → torso → arms
- Standing leg hamstring should feel intensely stretched
Don't pause long: This position is unstable — keep moving
What's happening: Driving standing hip forward, returning to vertical
- Drive through standing foot (mid-foot to heel)
- Pull standing hip FORWARD — "close the hip"
- Free leg comes back under, returns to ground (or stays up)
- Torso returns to upright
- Squeeze standing glute hard at top
- Breathing: Exhale through the drive
Tempo: 1-2 seconds (controlled power)
Feel: Standing hamstring and glute contracting intensely, balance returning
Finish options:
- Free foot touches down briefly between reps (easier)
- Free foot stays hovering (harder, continuous tension)
Quality cue: "Drive the hip forward like you're pushing a door open with your hip"
Key Cues
- "Hinge and reach back simultaneously — like a seesaw" — coordinates torso and leg
- "Keep hips level like headlights pointing forward" — prevents hip hiking
- "Make a 'T' with your body" — visual target for bottom position
- "Push the floor away with your foot" — activates posterior chain
- "Stand on one leg like it's the only leg you have" — full commitment to working leg
Tempo Guide
| Goal | Tempo | Example |
|---|---|---|
| Balance/Learning | 3-1-2-1 | 3s down, 1s pause, 2s up, 1s reset |
| Strength | 2-0-2-0 | 2s down, no pause, 2s up, no pause |
| Hypertrophy | 3-2-2-0 | 3s down, 2s pause, 2s up, no pause |
| Stability Challenge | 4-3-3-1 | 4s down, 3s hold, 3s up, 1s reset |
💪 Muscles Worked
Activation Overview
Primary Movers (Standing Leg)
| Muscle | Action | Activation |
|---|---|---|
| Hamstrings | Hip extension, eccentric loading during descent | █████████░ 95% |
| Glutes | Hip extension — driving standing hip forward | █████████░ 90% |
Secondary Muscles
| Muscle | Action | Activation |
|---|---|---|
| Erector Spinae | Maintains neutral spine under unilateral load | ███████░░░ 70% |
| Glute Medius | Hip abduction, prevents hip drop on standing side | ████████░░ 80% |
| Core/Abs | Anti-rotation, anti-lateral flexion, total stability | ████████░░ 85% |
Stabilizers
| Muscle | Role |
|---|---|
| Ankle Stabilizers (Peroneals, Tibialis) | Maintain balance through standing foot |
| Hip Stabilizers (Deep Hip Rotators) | Prevent hip hiking, maintain level pelvis |
| Obliques | Anti-rotation when using contralateral weight |
| Glute Minimus | Hip stability, prevents valgus collapse |
Compared to bilateral RDL:
- 60-80% more stabilizer activation
- 100% more balance demand
- Dramatically better at revealing left-right imbalances
Compared to B-Stance RDL:
- 40-50% more stability challenge
- 30-40% less load capacity
- Superior for balance and proprioception development
Athletic carryover: One of the highest — running, jumping, cutting all occur on one leg
⚠️ Common Mistakes
| Mistake | What Happens | Why It's Bad | Fix |
|---|---|---|---|
| Hip hiking | Free leg hip rises, body tilts laterally | Defeats purpose, lateral compensation | "Keep hips level like headlights," film from front |
| Rotating shoulders | Torso twists toward standing leg | Becomes oblique exercise, loses posterior focus | Keep shoulders square, use lighter weight |
| Bending standing knee | Squatting the movement | Removes hamstring tension | Lock knee angle, pure hip hinge |
| Free leg swings wide | Leg drifts to side instead of straight back | Balance compensation, poor alignment | "Leg extends straight back in line with torso" |
| Too much weight | Wobbling, losing balance, poor form | Zero muscle stimulus, just struggling | Drop to 50% of current weight |
| Rounding back | Lumbar flexion under load | Injury risk | Lighter weight, shorter ROM, brace harder |
| Touching free foot down | Using free leg for support | Becomes bilateral, defeats purpose | Keep free leg elevated or minimal touch |
Hip hiking — the free leg hip rises while the standing hip drops, creating lateral tilt. This is a stability compensation and means you're not using the hip stabilizers properly. Film yourself from the front — your belt line should stay perfectly level throughout the movement.
Self-Check Checklist
- Hips stay level entire movement (check in mirror)
- Shoulders stay square (not rotating)
- Standing knee angle stays fixed
- Free leg extends straight back (not to side)
- Torso and free leg form straight line at bottom
- Can maintain balance through full rep
- Feeling burn in standing hamstring/glute, not just wobbling
🔀 Variations
By Dumbbell Position
- Ipsilateral (Same Side)
- Contralateral (Opposite Side)
- Dual Dumbbell
| Aspect | Details |
|---|---|
| Setup | Dumbbell in same hand as standing leg |
| Challenge | EASIER — less rotational demand |
| Best For | Learning the movement, pure hamstring focus |
| Benefit | Can use slightly more weight |
Example: Right hand holds dumbbell, standing on right leg
When to use: First 4-8 weeks of learning single-leg RDL
| Aspect | Details |
|---|---|
| Setup | Dumbbell in opposite hand from standing leg |
| Challenge | HARDER — anti-rotation core demand |
| Best For | Athletic development, core strength |
| Benefit | More functional, better core activation |
Example: Left hand holds dumbbell, standing on right leg
When to use: After mastering ipsilateral version
Why it's harder: Weight pulls you into rotation — obliques must fire hard to keep shoulders square
| Aspect | Details |
|---|---|
| Setup | Dumbbell in each hand |
| Challenge | EASIEST for balance |
| Best For | More load capacity, strength focus |
| Benefit | Symmetrical loading, less wobble |
Best for: Intermediate lifters who want more weight but aren't ready for barbell
By Support Level
- Freestanding (Standard)
- Hand on Support
- Cable Attachment
| Aspect | Details |
|---|---|
| Support | None — full balance demand |
| Difficulty | Full difficulty |
| Best For | Standard execution once proficient |
| Aspect | Details |
|---|---|
| Support | Fingertips on wall, rack, or pole |
| Difficulty | Reduced balance demand |
| Best For | Learning, post-injury, elderly |
| Progression | Use less and less support over time |
How to progress: Start with full palm, reduce to fingertips, reduce to one finger, remove support
| Aspect | Details |
|---|---|
| Support | Hold cable handle |
| Difficulty | Moderate — cable provides some stability |
| Best For | Constant tension variation |
By Emphasis
- Strength Focus
- Balance/Stability
- Hypertrophy
| Variation | Change | Why |
|---|---|---|
| Heavy Dual DB | Two dumbbells, 6-10 reps | Maximum load capacity |
| Paused Single-Leg RDL | 3s hold at bottom | Isometric strength at end range |
| Deficit Single-Leg RDL | Standing foot on platform | Increased ROM, more stretch |
| Variation | Change | Why |
|---|---|---|
| Contralateral Light | Opposite hand, light weight | Max stability challenge |
| Slow Tempo | 5s eccentric, 3s hold | Extended time under tension for stabilizers |
| Eyes Closed | Close eyes (advanced!) | Removes visual balance cues |
| Variation | Change | Why |
|---|---|---|
| 1.5 Rep Single-Leg RDL | Full + half rep = 1 | Extra time in stretched position |
| Continuous Tension | Free foot never touches down | Non-stop tension |
| High-Rep | 12-20 reps | Metabolic stress |
Advanced Variations
| Variation | Key Difference | When to Use |
|---|---|---|
| Barbell Single-Leg RDL | Barbell in both hands | Advanced — maximum load |
| Deficit Single-Leg RDL | Stand on 2-4" platform | Increase ROM |
| Suitcase Single-Leg RDL | Heavy weight one side | Extreme anti-lateral flexion |
| Airborne/Airplane RDL | Arms spread wide (no weight) | Pure balance, regression |
📊 Programming
Rep Ranges by Goal
| Goal | Sets | Reps (per leg) | Rest | Load (% bilateral RDL) | RIR |
|---|---|---|---|---|---|
| Strength | 3-4 | 6-10 | 90s-2min | 40-55% | 1-2 |
| Hypertrophy | 3-4 | 8-12 | 60-90s | 35-50% | 2-3 |
| Balance/Stability | 3 | 10-15 | 60s | 25-40% | 3-4 |
| Learning | 3 | 8-10 | 90s | 20-35% | 4-5 |
Workout Placement
| Program Type | Placement | Rationale |
|---|---|---|
| Lower body day | After main lifts, before isolation | Unilateral accessory work |
| Athletic training | Early in session | Requires balance — do when fresh |
| Leg day | Mid-workout | After squats/deadlifts, before curls |
| Full-body | After bilateral work | Unilateral posterior chain |
Single-leg RDLs are FATIGUING neurologically due to balance demands. Place them when you're mentally fresh but after your heaviest bilateral work. They're accessory exercises, not main lifts.
Frequency
| Training Level | Frequency | Volume Per Week |
|---|---|---|
| Beginner | Not recommended | Master bilateral RDL first |
| Intermediate | 1-2x/week | 6-9 sets per leg total |
| Advanced | 2x/week | 9-12 sets per leg, varying loads |
| Athletes | 2-3x/week | 6-9 sets per leg, emphasis on balance |
Set Structure Options
Option 1: Complete one leg fully
- 3 sets left leg → Rest → 3 sets right leg
- Pro: Better focus, don't have to keep switching
- Con: First leg gets more rest
Option 2: Alternate legs each set
- Set 1: Left → Rest → Set 1: Right → Rest → Set 2: Left → etc.
- Pro: Equal rest for both legs
- Con: More setup time
Option 3: Alternating reps (circuit style)
- 10 reps left → immediately 10 reps right → rest
- Pro: Time-efficient
- Con: Fatiguing, form may degrade
Progression Path
Supersets & Pairings
Great to pair with:
- Bulgarian split squats — quad/hamstring unilateral combo
- Single-leg leg curls — hamstring isolation
- Step-ups — quad-dominant unilateral
- Core work — already bracing hard, add direct core
- NOT with: Other balance-intensive exercises (too fatiguing)
Sample Weekly Structure
Example 1: Intermediate Lifter
- Monday: Bilateral RDL 4x8, Single-Leg RDL 3x10/leg
- Thursday: Single-Leg RDL 3x12/leg (lighter, more volume)
Example 2: Athlete
- Tuesday: Single-Leg RDL 4x8/leg (heavier, strength)
- Friday: Single-Leg RDL 3x12/leg (lighter, stability focus)
Example 3: Hypertrophy
- Lower A: Bilateral RDL 4x10, B-Stance RDL 3x12/leg
- Lower B: Single-Leg RDL 4x10/leg, Leg Curls 3x15
🔄 Alternatives & Progressions
Exercise Progression Path
Regressions (Easier)
| Exercise | When to Use | Link |
|---|---|---|
| B-Stance RDL | Not ready for full single-leg balance | ✓ |
| Supported Single-Leg RDL | Need hand on wall/rack for stability | |
| Romanian Deadlift | Build base strength first | ✓ |
| Split Stance RDL | Between bilateral and B-stance |
Progressions (Harder)
| Exercise | When Ready | Link |
|---|---|---|
| Barbell Single-Leg RDL | Mastered dumbbell version, want more load | |
| Deficit Single-Leg RDL | Want increased ROM | |
| Single-Leg RDL to Reverse Lunge | Combo movement for athletes |
Alternatives (Same Goal, Different Movement)
- Unilateral Hinge Options
- Other Unilateral Lower
- Balance-Focused
| Alternative | Equipment | Key Difference |
|---|---|---|
| B-Stance RDL | Dumbbells/Barbell | Back toe provides 10-20% support |
| Kickstand RDL | Dumbbells/Barbell | Same as B-stance (different name) |
| Single-Leg Cable RDL | Cable machine | Constant tension, different resistance curve |
| Alternative | Pattern | Trade-off |
|---|---|---|
| Bulgarian Split Squat | Squat pattern | More quad, less hamstring |
| Step-Up | Squat pattern | Less balance demand, more load |
| Single-Leg Leg Press | Squat pattern | Machine stability, max load |
| Alternative | Focus |
|---|---|
| Airborne RDL | Pure balance (bodyweight) |
| Single-Leg Deadlift | Balance + strength |
| Pistol Squat | Extreme single-leg challenge |
🛡️ Safety & Contraindications
Who Should Be Careful
| Condition | Risk | Modification |
|---|---|---|
| Ankle instability | Fall risk, chronic ankle sprains | Use hand support initially OR regress to B-stance |
| Balance disorders | Cannot safely perform single-leg work | Stick to bilateral or B-stance variations |
| Acute hamstring injury | Stretching under load | Wait until healed, rebuild with bilateral first |
| Neuropathy | Reduced proprioception | Use support, consider alternative exercises |
| Elderly (fall risk) | Serious injury from falling | Mandatory hand support OR avoid exercise |
- Cannot maintain balance even with light/no weight
- Sharp pain in standing hamstring (not stretch/burn)
- Ankle pain or instability
- Dizziness or vertigo
- Inability to keep hips level
Injury Prevention
| Strategy | Implementation |
|---|---|
| Master prerequisites | 6+ months bilateral RDL, 2-3 months B-stance RDL |
| Start bodyweight | First 2-3 sessions: no weight, perfect balance |
| Use support initially | Hand on wall/rack until balance is solid |
| Progress gradually | Add 5 lbs maximum when you hit all reps with perfect form |
| Train both sides equally | Don't just hammer your strong leg |
| Clear training area | Remove obstacles in case you lose balance |
Balance Safety
If you lose balance during a set:
- Put free leg down — it's okay, reset and continue
- Drop the weight safely — better to bail than force it
- Use support — no shame in touching wall/rack
- Reduce weight — if constantly losing balance, too heavy
- Film yourself — identify what's breaking down
Setup your environment:
- Clear space around you (no obstacles)
- Perform near wall or squat rack for emergency support
- Use lighter weight than you think necessary
- Don't train to failure (unlike bilateral movements)
- Stop set 2-3 reps before balance completely fails
Imbalance Management
This exercise WILL expose significant left-right differences:
Normal: 10-20% difference in reps or weight Concerning: 30%+ difference — may need assessment Protocol for imbalances:
- Use weight your weaker leg can handle
- Train weaker leg first
- Match reps on strong leg (don't exceed)
- Consider 1 extra set on weak leg
- Reassess after 8-12 weeks
🦴 Joints Involved
| Joint | Action | ROM Required | Stress Level |
|---|---|---|---|
| Hip (standing leg) | Flexion/Extension | 80-100° flexion | 🔴 High |
| Spine | Neutral maintenance | Minimal movement | 🟡 Moderate |
| Knee (standing leg) | Slight flexion (static) | 10-20° flexion held | 🟢 Low |
| Ankle (standing leg) | Dorsiflexion, stabilization | Moderate, with stability demand | 🔴 High |
| Hip (free leg) | Extension | Full extension | 🟢 Low |
Mobility Requirements
| Joint | Minimum ROM | Test | If Limited |
|---|---|---|---|
| Standing hip | 90° flexion with neutral spine | Single-leg toe touch | Hamstring flexibility work, hip mobility |
| Standing ankle | 15-20° dorsiflexion | Knee can travel forward over toes | Ankle mobility drills, calf stretching |
| Hamstrings | Excellent flexibility | Sit and reach, toe touch | Daily hamstring stretching, bilateral RDL |
| Hip extension (free leg) | Full extension | Can extend leg straight behind | Hip flexor stretching, lunge variations |
Balance & Proprioception
Ankle stability is critical:
- Standing ankle must stabilize in three planes
- Weak ankles = chronic instability = injury risk
- Build ankle strength with: calf raises, single-leg balance work, ankle mobility
Proprioceptive demands:
- Visual feedback (can see position)
- Vestibular system (inner ear balance)
- Proprioceptors in foot, ankle, hip
If balance is poor:
- Train barefoot (better proprioception)
- Practice single-leg balance holds
- Use hand support initially
- Consider regressing to B-stance
The joint mobility requirements are the same bilaterally, but this exercise will REVEAL if one side is tighter, weaker, or less stable than the other. This is valuable diagnostic information — use it to guide your training priorities.
❓ Common Questions
When am I ready to progress from B-stance to single-leg RDL?
Progress when you can:
- Perform 3-4 sets of 12 B-stance RDLs per leg with perfect form
- Minimal reliance on back toe (90%+ weight on front leg)
- No balance issues during B-stance
- Strong mind-muscle connection with working hamstring
- 6+ months of consistent bilateral RDL training
- 2-3 months of B-stance RDL mastery
Test: Can you do 3 sets of 8 single-leg RDLs with bodyweight only, maintaining perfect balance? If yes, you're ready to add light weight.
Why do I wobble so much?
Wobbling is NORMAL when learning this movement. Common causes:
- Too much weight — drop to 50% of current weight or bodyweight only
- Going too fast — slow down to 3-4 second tempo
- Weak ankle stabilizers — practice single-leg balance work
- Core not engaged — brace harder before each rep
- Visual cues missing — practice in front of mirror or pick a focal point
Fix protocol: 2-3 weeks of bodyweight-only practice, 3 seconds down, 3 seconds up, focus on smooth movement. THEN add light weight.
Should I let my free foot touch the ground between reps?
Two approaches, both valid:
Option 1: Tap down between reps (EASIER)
- Free foot briefly touches floor between each rep
- Pro: Can reset balance, perform more reps
- Con: Less continuous tension
- Best for: Learning, higher reps (12-20)
Option 2: Keep free leg elevated entire set (HARDER)
- Free leg never touches ground
- Pro: Continuous tension, harder stability challenge
- Con: Limits reps, more fatiguing
- Best for: Strength focus, lower reps (6-10)
Recommendation: Start with tap-downs, progress to continuous when proficient
Ipsilateral vs. contralateral — which should I use?
Start ipsilateral (same side), progress to contralateral (opposite side)
Ipsilateral (dumbbell same hand as standing leg):
- Easier to balance
- Less core demand
- Better for learning
- Can use slightly more weight
- Use for: First 4-8 weeks
Contralateral (dumbbell opposite hand from standing leg):
- Harder — anti-rotation core challenge
- More functional (mimics real-world demands)
- Better athletic carryover
- Use for: After mastering ipsilateral
Advanced athletes: Use contralateral almost exclusively
One leg is WAY weaker — is this normal?
YES — extremely common
Typical imbalances:
- 10-20% difference: Normal, expected
- 20-30% difference: Significant, needs attention
- 30%+ difference: May warrant assessment
What to do:
- Use the weight your weaker leg can handle (don't use different weights per leg)
- Train weaker leg FIRST when you're fresh
- Match reps on stronger leg (don't go higher)
- Optional: Add 1 extra set to weaker leg
- Be patient — takes 8-16 weeks to see meaningful improvement
Why this happens: Leg dominance (left vs. right), sport patterns (e.g., soccer players), previous injury, postural habits
My hips rotate — how do I keep them level?
Hip rotation/hiking is the #1 form breakdown
Causes:
- Weak glute medius on standing side
- Too much weight
- Poor core engagement
- Hip mobility limitation
Fixes:
- Film from front — see the rotation clearly
- Reduce weight 50% — master movement with light load
- "Headlights forward" cue — imagine headlights on hip bones, point them forward
- Glute medius strengthening — add clamshells, side planks, lateral band walks
- Slower tempo — 4 seconds down gives you time to maintain position
Practice drill: Single-leg RDL in front of mirror, watch hip bones stay level
How much weight compared to bilateral RDL?
General guideline: 35-50% of bilateral RDL weight
Example calculations:
- Bilateral RDL: 100 lbs total (50 lb dumbbells each hand)
- Single-leg RDL: 35-50 lbs (one dumbbell)
Why so much lighter:
- Balance is limiting factor
- Stability demand is extreme
- Less overall load capacity when unilateral
Progression timeline:
- Month 1-2: 10-20 lbs (learning)
- Month 3-6: 20-40 lbs (building)
- Month 6+: 40-70 lbs (advanced, depending on body weight)
Reality check: If you can't maintain perfect balance and form, you're too heavy — this isn't a max strength exercise.
Should I do these if I'm a beginner?
NO — master prerequisites first
Prerequisites (6-12 months minimum):
- Bilateral RDL with perfect form (3-4 sets x 12 reps)
- B-Stance RDL proficiency (3 sets x 12 per leg)
- Single-leg balance (can stand on one leg 30+ seconds)
- Good hamstring flexibility
Beginner timeline:
- Months 1-6: Master bilateral RDL
- Months 7-9: Add B-stance RDL
- Months 10+: Begin single-leg RDL progression
Don't rush it — building the foundation properly prevents injury and ensures better results long-term.
📚 Sources
Biomechanics & Muscle Activation:
- McCurdy, K.W. et al. (2010). "Comparison of Lower Extremity EMG Between Bilateral and Unilateral RDL" — Tier A
- Speirs, D.E. et al. (2016). "Unilateral vs. Bilateral Squat Training for Strength, Sprint, and Agility" — Tier A
- ExRx.net Exercise Directory — Single-Leg RDL Analysis — Tier C
Unilateral Training & Asymmetry:
- Bishop, C. et al. (2018). "Inter-Limb Asymmetries: Understanding How to Calculate Differences" — Tier A
- Malfait, B. et al. (2014). "How Reliable Are Lower-Limb Kinematics and Kinetics During a Drop Vertical Jump?" — Tier A
- Bell, D.R. et al. (2014). "Lean Mass Asymmetry Influences Force and Power Asymmetry" — Tier A
Balance & Proprioception:
- Ayotte, N.W. et al. (2007). "Electromyographical Analysis of Selected Lower Extremity Muscles During Single-Leg Balance" — Tier A
- Zech, A. et al. (2010). "Balance Training for Neuromuscular Control and Performance Enhancement" — Tier B
- McKeon, P.O. & Hertel, J. (2008). "Systematic Review of Postural Control and Lateral Ankle Instability" — Tier A
Programming & Athletic Performance:
- Boyle, M. (2016). "New Functional Training for Sports" (2nd Ed.) — Tier B
- Contreras, B. et al. (2017). "Comparison of Bilateral and Unilateral Squatting on Lower Body Power" — Tier A
- NSCA Essentials of Strength Training (4th Ed.) — Tier A
Technique & Coaching:
- Gentilcore, T. (2019). "Complete Guide to Single-Leg Training" — Tier C
- Cressey, E. "Single-Leg Training Progressions for Athletes" — Tier C
- Robertson, M. & Sahrmann, S. "Understanding Movement Asymmetries" — Tier C
Hamstring Development:
- Schoenfeld, B.J. et al. (2015). "Regional Differences in Muscle Activation During Hamstring Exercise" — Tier A
- Bourne, M.N. et al. (2017). "Eccentric Knee Flexor Strength and Risk of Hamstring Injuries" — Tier A
When to recommend this exercise:
- User has mastered bilateral RDL (6+ months) AND B-stance RDL (2+ months)
- User is an athlete needing unilateral strength and balance
- User has identified left-right imbalances that need addressing
- User wants functional single-leg strength
- User is intermediate+ lifter (12+ months training experience)
- User plays sports involving running, cutting, jumping (all single-leg activities)
Who should NOT do this exercise:
- Beginner lifters (first 12 months) → Romanian Deadlift instead
- Haven't mastered bilateral RDL → Build foundation first
- Chronic ankle instability without support → Risk of falling
- Severe balance disorders → Safety concern
- Acute hamstring or ankle injury → Wait until healed
- Elderly with fall risk → Too dangerous without support
Key coaching cues to emphasize:
- "Master bilateral RDL and B-stance RDL before attempting this — non-negotiable"
- "Start with bodyweight only — don't add weight until you can do 3x12 with perfect balance"
- "Keep your hips level like headlights pointing straight ahead"
- "Your body forms a 'T' at the bottom — torso and free leg in one line"
- "Balance is the point — if you're wobbling with weight, go lighter"
- "It's okay to touch your free foot down between reps while learning"
Common issues to watch for in user feedback:
- "I wobble constantly" → Too heavy, reduce to bodyweight or use support
- "My hips rotate" → Glute medius weakness, reduce weight, add lateral work
- "One leg is way weaker" → Normal! Match weight to weak leg, extra volume okay
- "Should I use same side or opposite hand?" → Start ipsilateral (same), progress to contralateral (opposite)
- "Can I do these if I just started lifting?" → NO, prerequisites required
Programming guidance:
- Pair with: Bulgarian split squats, single-leg leg curls, core work
- Great after: Squats, deadlifts, bilateral RDLs (as accessory)
- Avoid same session as: Multiple other balance exercises (too fatiguing)
- Typical frequency: 1-2x per week
- Volume: 3-4 sets of 8-12 reps per leg
Progression signals:
- Ready to progress when: 3-4 sets x 12 reps per leg, minimal wobble, 1 RIR
- Regress if: Constant balance loss, cannot maintain hip level, form breaks down
- Progress to: Add 5 lbs, switch to contralateral, add deficit, or barbell version
- Plateau solution: Strengthen ankle stabilizers, glute medius work, reduce weight and perfect form
Red flags:
- Hip hiking (lateral tilt) during movement → Glute medius weakness
- Wobbling excessively with light weight → Ankle instability or not ready
- Back rounding → Weight too heavy or hamstring tightness
- Free leg swinging wide → Compensation, reduce weight
- Can only do 3-4 reps due to balance → Too advanced, regress
Special considerations:
- Prerequisites are critical — don't skip bilateral and B-stance phases
- Balance is the point — this isn't about maxing out weight
- Imbalances are revealing — 20%+ difference is common initially
- Athletes benefit most — highest carryover to sport performance
- Ankle strength matters — weak ankles will limit this exercise significantly
Teaching progression for qualified lifters:
- Week 1-2: Bodyweight only, 3x10/leg, focus on balance and form
- Week 3-4: Light dumbbell (10-20 lbs) ipsilateral, 3x8-10/leg
- Week 5-8: Gradually increase weight (5 lbs at a time), maintain form
- Week 9-12: Switch to contralateral grip if ready
- Month 4+: Working weight established (35-50% of bilateral RDL)
Decision tree for variations:
- Can't balance freestanding: Use hand support OR regress to B-stance
- Want more weight: Use dual dumbbells
- Want core challenge: Use contralateral grip
- Want max stability demand: Use contralateral with slow tempo
- Beginner to movement: Start ipsilateral with light weight
Critical safety message: "This is an advanced exercise that requires solid prerequisites — bilateral RDL mastery and B-stance proficiency. If you're wobbling excessively, you're either too heavy or not ready. There's zero shame in building up slowly. Balance is a skill that develops over time, not something you force."
Last updated: December 2024