The single-leg Romanian deadlift is one of the most complete lower body exercises available. In a single movement, it develops posterior chain strength (glutes and hamstrings), single-leg balance and proprioception, hip stability, and the unilateral strength asymmetry correction that bilateral exercises cannot provide. For runners, it addresses the specific hip and posterior chain demands of every running stride. For athletes, it develops the single-leg explosive base that transfers to sprinting, jumping, and direction changes. For anyone dealing with lower back pain from gluteal weakness, it is one of the most direct interventions available.
Despite its value, the single-leg RDL is one of the most commonly performed incorrectly of any exercise in the gym. Small technique errors compound significantly when the movement is performed on one leg, producing compensatory patterns that reduce the training effect and increase injury risk. This guide covers technique in the depth needed to perform this exercise correctly, the complete range of variations including the barbell version, and a complete programming framework.
What the Single-Leg RDL Is
The single-leg Romanian deadlift is a hip hinge exercise performed on one leg, where the athlete pushes the hips backward while the torso leans forward and the free leg extends behind for counterbalance, lowering a weight toward the floor before driving the hips forward to return to standing.
It differs from the conventional Romanian deadlift in that:
- Only one leg is in contact with the floor throughout
- The free leg extends behind and serves as a counterbalance
- The balance and proprioceptive demands are significantly greater
- The hip stabilisation demand on the standing leg is dramatically increased
- Side-to-side strength and stability asymmetries are revealed and addressed
It differs from a single-leg deadlift (where the weight is lifted from the floor from a single-leg stance) in that:
- The movement begins and ends at the standing position rather than the floor
- The range of motion is controlled by hamstring flexibility rather than by the floor
- The emphasis is on hip hinge mechanics and posterior chain loading rather than maximum load from the floor
Muscles Worked
Primary muscles:
- Gluteus maximus (standing leg): The primary hip extensor, driving the hip forward during the return phase and controlling the hip hinge during the descent
- Hamstrings (standing leg): Both the biceps femoris, semitendinosus, and semimembranosus actively control the hip hinge descent and drive the return
Secondary muscles:
- Gluteus medius (standing leg): Works isometrically throughout to maintain pelvic level and prevent the hip from dropping on the free leg side
- Gluteus minimus (standing leg): As covered in the glute minimus exercises article on this site, contributes to hip stabilisation during the single-leg loading
- Adductors (standing leg): Contribute to medial hip stability during the single-leg stance
- Erector spinae: Maintain a neutral lumbar spine throughout the movement
- Core (anti-rotation and anti-lateral flexion): Resist the rotational and lateral forces produced by the asymmetric loading of single-leg stance
Why the standing leg does significantly more work than it appears:
The single-leg RDL is not simply a Romanian deadlift performed on one leg. The absence of the second leg’s support removes the bilateral stability that makes bilateral exercises easier than their unilateral counterparts. The standing leg must control the hip hinge, maintain balance, prevent pelvic drop, resist trunk rotation from the asymmetric load, and produce the returning force entirely independently. This is why the single-leg RDL is challenging with loads that feel modest during bilateral exercises.
Step-by-Step Technique
Setup
Foot position:
Stand with the feet hip-width apart. Shift the weight onto one foot completely. The standing foot should be flat on the floor with the weight distributed evenly across the forefoot and heel, not shifted to the outside of the foot (supination) or the inside (pronation).
Standing knee:
The standing knee should be slightly bent throughout the movement, never fully locked. The degree of bend remains constant: approximately 10 to 15 degrees of knee flexion throughout. This is not a single-leg squat: the knee does not bend further during the descent.
Load position:
The load can be held in several positions (covered in the variations section below). For the standard dumbbell version, hold a dumbbell in the hand opposite to the standing leg (contralateral loading). This is the most balanced option for learning the movement.
The Descent
Step 1 — Initiate from the hip:
Push the hips backward as if reaching the sitting bone of the standing leg toward the wall behind you. This hip-push initiation is the most important single cue in the single-leg RDL. Without it, the movement becomes a forward lean of the trunk rather than a genuine hip hinge, losing the hamstring stretch that is the primary training stimulus.
Step 2 — Allow the torso to follow:
As the hips push backward, the torso naturally leans forward. Do not consciously push the torso down: allow it to follow the hips. The torso and the free leg should move as counterbalancing levers around the standing hip joint.
Step 3 — Free leg extension:
As the torso leans forward, extend the free leg behind you. The free leg is not simply hanging: it should be actively extended to provide counterbalance. The foot of the free leg should be pointing toward the floor or turned slightly outward to keep the hip in a neutral rotation position.
Step 4 — Maintain neutral spine:
Throughout the descent, the spine should maintain its natural neutral curve. Avoid rounding the lower back or extending it excessively. Think of keeping a long, neutral spine from the tailbone to the crown of the head.
Step 5 — Lower to the appropriate depth:
The movement should be limited by hamstring flexibility, not by a target depth on the floor. Lower until a comfortable hamstring stretch is felt in the standing leg or until the spine begins to round, whichever comes first. For most people, this is when the torso is parallel to the floor or slightly above parallel.
Step 6 — Hold briefly:
A brief pause at the bottom of the movement (1 to 2 seconds) eliminates momentum and ensures the return phase is driven by muscular effort rather than rebound.
The Return
Drive the hip forward:
Return to standing by driving the standing hip forward and downward simultaneously. Think of the movement as a hip extension rather than simply standing up. The glute of the standing leg should be the primary driver.
Control the free leg:
As the body returns to vertical, the free leg lowers to a position beside the standing leg. The movement should be controlled rather than swinging the free leg down rapidly.
Return to neutral:
In the standing position, both feet should be on the floor and the hips and shoulders should be level before the next repetition begins.
Key Technique Cues
The T-position cue: At the bottom of the movement, the torso and the free leg should form a horizontal line, like the top of the letter T with the standing leg as the vertical. This is the target position if hamstring flexibility allows.
The broom handle cue: Imagine a broom handle resting along the spine from the tailbone to the back of the head. Throughout the descent, the broom handle should remain in contact with the tailbone, the middle back, and the back of the head. If it loses contact with any of these points, the spine has deviated from neutral.
The hip push-back cue: Rather than thinking about lowering the torso, think exclusively about pushing the standing hip backward. This automatically produces the correct movement pattern.
The hip level cue: The hips should remain level throughout the movement. The most common error is allowing the hip of the free leg to rise (hip hike) or drop. Think of keeping a glass of water balanced on the pelvis throughout.
The standing knee cue: The standing knee should point in the same direction as the standing toes throughout. Knee cave (the knee drifting inward) during the return phase is a sign of hip abductor or external rotator weakness on the standing side.
Common Mistakes and How to Fix Them
Mistake 1: Rounding the lower back
What it looks like: The lumbar spine rounds into flexion during the descent, losing the natural lumbar curve.
Why it happens: Hamstring flexibility is insufficient to allow the degree of hip hinge attempted without spinal compensation.
Fix: Reduce the range of motion. Only lower to the point where neutral spine can be maintained. Use a slightly bent free-leg knee (rather than fully extended) to reduce the hamstring stretch demand initially.
Mistake 2: The torso-lean instead of the hip hinge
What it looks like: The trunk leans forward without the hips pushing backward, producing a forward bow rather than a hip hinge.
Why it happens: Insufficient awareness of the hip hinge pattern, particularly in beginners.
Fix: Practice standing near a wall and touching the standing hip to the wall on each repetition. The hip-to-wall contact reinforces the hip-push-back initiation. A hip hinge with a dowel or broom handle along the spine also reinforces correct pattern.
Mistake 3: Hip hike on the free leg side
What it looks like: The hip of the free leg rises higher than the standing hip during the descent.
Why it happens: The hip abductors and external rotators of the standing leg are not adequately controlling pelvic position.
Fix: Perform the exercise more slowly and focus specifically on keeping the pelvis level. Use a lighter load or no load until pelvic control is consistent. Strengthen the gluteus medius on the standing side with clamshells and lateral band walks before adding load to the single-leg RDL.
Mistake 4: Knee cave on the return
What it looks like: The standing knee drifts inward as the body drives back to standing.
Why it happens: Gluteus medius and external rotator weakness on the standing side, particularly under fatigue.
Fix: Cue the knee toward the fifth toe during the return. Reduce the load until the knee tracks correctly. Address the underlying gluteal weakness.
Mistake 5: Losing balance consistently
What it looks like: Repeated stepping down with the free foot, hopping, or requiring external support to complete repetitions.
Why it happens: Single-leg balance is insufficient for the exercise, often combined with an error in movement pattern.
Fix: Practice single-leg balance for 30 seconds per leg before attempting the exercise. Use a very light load or no load initially. Perform the exercise slowly and deliberately. Allowing the free foot to lightly graze the floor between repetitions is a useful intermediate step before full balance is established.
Mistake 6: Free leg swinging for momentum
What it looks like: The free leg swings down rapidly at the end of each rep, and the momentum carries the body back to standing rather than muscular effort driving the return.
Why it happens: Fatigue or insufficiently controlled movement.
Fix: Pause at the bottom for 1 to 2 seconds before returning. Control the free leg throughout rather than allowing it to swing freely.
Variations and Progressions
Bodyweight Single-Leg RDL
When to use: Learning the movement pattern, warm-up, early rehabilitation.
How: Perform the movement as described above with no external load. Focus entirely on movement quality, pelvic level, and hamstring stretch. The free arm can reach forward to assist with balance.
Dumbbell Single-Leg RDL (Contralateral Loading)
When to use: Foundation level, most appropriate for learning loaded technique.
How: Hold one dumbbell in the hand opposite to the standing leg. Contralateral loading creates a slight rotational challenge that improves the anti-rotation core demand while remaining balanced enough to learn on.
Dumbbell Single-Leg RDL (Ipsilateral Loading)
When to use: Once contralateral loading is well-established, to increase the core anti-rotation challenge.
How: Hold one dumbbell in the hand on the same side as the standing leg. The ipsilateral load creates a greater rotational challenge because it pulls the loaded side downward.
Double Dumbbell Single-Leg RDL
When to use: Intermediate to advanced, when balanced loading and higher loads are the goal.
How: Hold a dumbbell in each hand. Both arms lower toward the floor on either side of the standing leg. Allows heavier loading than single-dumbbell versions.
Barbell Single-Leg RDL
When to use: Advanced athletes seeking maximum loading or transferring from barbell training to the single-leg pattern.
How:
- Set up with a barbell in a hip-width grip as for a conventional RDL
- Shift all weight onto one foot and lift the other foot off the floor
- Perform the hip hinge as described above, lowering the bar along the front of the standing leg
- The bar stays close to the standing leg throughout
- Return to standing and complete all reps before switching legs
Barbell-specific challenges: The barbell creates a longer lever than dumbbells and challenges anti-rotation more significantly. The bar path must remain close to the standing leg. Balance is more challenging than with dumbbells because the barbell is a fixed length that prevents arm adjustment for balance correction.
Barbell technique tip: A slight outward rotation of the standing foot (5 to 10 degrees) improves stability with the barbell by widening the base of support without significantly changing the hip hinge mechanics.
Kettlebell Single-Leg RDL
When to use: When a kettlebell is available and dumbbells are not, or for the grip-training benefit of the kettlebell handle.
How: Functionally identical to the dumbbell version. The kettlebell can be held in the contralateral hand for the standard variation.
Single-Leg RDL to Row (Combined Exercise)
When to use: Athletic development, efficiency when training time is limited.
How: At the bottom of the single-leg RDL, perform a single-arm row with the dumbbell before returning to standing. This develops posterior chain strength, single-leg balance, and upper back strength simultaneously.
Banded Single-Leg RDL
When to use: Rehabilitation, early loading when dumbbells are too heavy, or as an activation exercise.
How: Loop a resistance band under the standing foot and hold the other end in the opposite hand. Perform the hip hinge against the band resistance.
Programming the Single-Leg RDL
As a primary posterior chain exercise:
Place the single-leg RDL early in the training session after the warm-up but before fatiguing accessory work.
- Sets and reps: 3 to 4 sets of 6 to 10 reps per leg
- Loading: Choose a load that produces fatigue by the final 2 to 3 reps of each set with good form
- Rest: 90 seconds to 2 minutes between sets
As a supplementary exercise:
After primary bilateral exercises (conventional deadlift, squat):
- Sets and reps: 3 sets of 10 to 12 reps per leg with moderate load
- Rest: 60 to 90 seconds
As a rehabilitation exercise:
- Begin with bodyweight or very light load
- 2 to 3 sets of 8 to 10 per leg
- Daily or on alternate days depending on recovery
- Progress load only when form is consistently clean
Training frequency:
2 times per week is appropriate for most athletes when the single-leg RDL is used as a primary or supplementary exercise. Daily use at lower intensities is appropriate in rehabilitation contexts.
The asymmetry correction protocol:
If one leg is noticeably weaker or less stable than the other, give the weaker leg an additional set per session until the asymmetry reduces to less than 10 percent. This is the most practical approach to addressing the side-to-side strength differences that single-leg RDL testing reveals.
Sport-Specific Applications
Runners: The single-leg RDL is the most specific posterior chain strengthening exercise for running mechanics. Every running stride involves a single-leg hip extension supported by the posterior chain, and the hip stability demands of the single-leg RDL directly replicate the pelvic stabilisation demands of running stance.
Sprinters: Include the single-leg RDL as a posterior chain strength accessory alongside the hip thrust and Romanian deadlift. The specific hip extension and gluteal activation of the single-leg RDL transfers directly to the explosive push-off of each sprint stride.
Basketball and jumping athletes: Single-leg landing mechanics are determined in part by the single-leg posterior chain strength developed through the single-leg RDL. Athletes who develop strong, stable single-leg RDL mechanics show better landing control and reduced knee valgus during sport-specific landings.
Football and multidirectional athletes: The hip stability component of the single-leg RDL directly develops the pelvic control during the stance phase of cutting and direction changes.
Frequently Asked Questions
Should the free leg be straight or bent?
The free leg is typically kept relatively straight during the single-leg RDL, providing a counterbalance to the forward-leaning torso. However, a slight bend in the free knee is appropriate for people with tighter hamstrings or limited hip flexibility, as it reduces the hamstring tension demand and allows better balance. The key is that the free leg actively extends rather than hanging passively.
How low should I go?
Lower only as far as neutral spine can be maintained and a hamstring stretch is felt. For most people, this is to parallel (torso horizontal) or slightly above. Lowering past the point where the spine begins to round to reach the floor reduces the training stimulus and increases lower back stress.
Why do I lose balance so consistently?
Consistent balance loss is either a balance deficit (single-leg proprioception and stability) or a technique error. The most common technique-related cause is not pushing the hip backward sufficiently, which means the weight distribution stays over the toes rather than the heel, making balance much harder. Practice the hip push-back against a wall as described in the mistake section. If balance remains a challenge, spend 2 to 3 weeks on single-leg balance training before returning to the single-leg RDL with load.
Is the single-leg RDL safe for people with lower back pain?
The single-leg RDL, performed with correct technique and appropriate loading, is generally safe and often beneficial for lower back pain because it develops the posterior chain strength that reduces lumbar extensor compensation. However, anyone with acute lower back pain should begin with bodyweight only and focus on maintaining neutral spine throughout. If lower back pain is consistently reproduced during the exercise, the load is too heavy or technique needs correction. See the hip lower back exercises article on this site.
How is the single-leg RDL different from a regular RDL?
The conventional Romanian deadlift develops bilateral posterior chain strength with both feet on the floor. The single-leg RDL develops unilateral posterior chain strength with one foot on the floor, revealing and addressing side-to-side asymmetries that the bilateral version conceals. The single-leg version also develops significantly greater single-leg balance, hip stabilisation, and pelvic control. Both exercises are valuable and complement each other in a complete programme.