Lower Back · Dumbbell
Single-Leg Romanian Deadlift: One-Sided Hinge Work for Erectors and Symmetry
One leg down, one leg back, hips locked level — this is the hinge where each side has to earn its own reps instead of hiding behind the other.
Illustration adapted from Everkinetic via workout-guide, CC BY-SA 4.0. Full credits.
| Equipment | Dumbbell |
|---|---|
| Back zone | Lower Back · Symmetry |
| Muscles | Erectors |
| Level | Intermediate |
| Typical work | 3 × 8–10 |
| Where | Home or gym |
What is the Single-Leg Romanian Deadlift?
The single-leg Romanian deadlift is a dumbbell hip hinge performed on one standing leg while the other extends behind you as a counterweight. It loads the erector spinae one side at a time and forces the pelvis to stay square against rotation, which is why BackMaxx tags it to the Lower Back zone and to Symmetry.
The one cue that matters: Hinge on one leg with square hips — reach the dumbbell toward the floor, not your toes.
Why the Single-Leg Romanian Deadlift is worth doing
- Gives each side its own set, so the steadier leg cannot quietly absorb more of the work
- Loads the erectors against rotation as well as folding, a demand no two-legged hinge produces
- Needs one dumbbell and a body length of floor, so it survives the move to a home session intact
- Keeps the difficulty in the balance rather than the load, so a small weight still makes a hard set
How to do the Single-Leg Romanian Deadlift
- Set the standing leg Stand on one foot with a soft knee and spread your toes into the floor. Hold the dumbbell in the hand opposite the standing leg so the load pulls across your body.
- Square the pelvis Before anything moves, point both hip bones straight ahead. Picture two headlights on the front of your pelvis and keep them level and forward for the entire rep.
- Hinge and extend Push the standing hip back and let the free leg travel behind you until torso and leg form one line. The dumbbell tracks down past your standing shin, not out towards your toes.
- Stop at the stretch Go until the standing hamstring pulls tight or the hips begin to open sideways, whichever arrives first. That is your bottom for today, and it moves session to session.
- Return to tall Drive the standing hip forward and bring the rear leg down under control. Stand fully upright and let the balance settle before the next rep starts.
- Match both sides Run the harder side first and hold the other side to exactly the reps it managed. Anything past that number is volume only one leg is receiving.
Muscles worked
The Erectors — erector spinae — hold the trunk in one line while a single hip folds underneath it. On one leg the dumbbell also sits off centre, so the erector column on the standing side is resisting your torso twisting as well as folding. That anti-rotation job is what separates this from every two-legged hinge in the library.
BackMaxx also tags this movement to Symmetry, the only one in the deadlift family that carries it. Symmetry in the app is a visual read of left against right, and single-sided work is the direct way to give the side that usually does less its own honest set — see the guide to back symmetry for how the zone is scored.
Glutes and hamstrings on the standing leg drive the rep, and the small muscles of the foot and ankle decide whether it looks like an exercise or a save. Expect a fraction of the load you use on the two-legged version. That is the movement working as designed.
| <a href=”/back-muscles/erectors/”>Erectors</a> | Erector spinae — The Christmas tree either side of the spine, and the base of every heavy pull. |
|---|
Form tips
- The back leg is a counterweight. The rear foot should finish level with your hips, sole facing the ceiling. If the leg stays low and bent, the torso has nothing to balance against and you end up reaching for the floor with your shoulders instead of hinging at the hip.
- Measure squareness at the hips. Plenty of people keep their shoulders level while the top hip quietly rolls open, which turns a hinge into a twist. The pelvis is what you check, not the shoulder line.
- Standing toes point forward. Let the standing foot turn out and the hip opens with it. Point the foot dead ahead and the rotation has nowhere to go.
- Two fingers on a rack. If balance rather than the hinge is the limiter, rest two fingers of the free hand on a rack upright. You keep the erector work and lose the wobble, and the fingers come off as the reps get steady.
Common mistakes
- Letting the top hip roll open
- The upper hip rotating towards the ceiling turns the movement into a twist and takes tension off the standing side. Set the pelvis level before the first rep and end the set the moment it stops staying there.
- Reaching for the toes
- Chasing depth by lowering the dumbbell towards the foot rounds the upper back and shortens the hip travel. Send the weight straight down past the shin and let the hips decide how far the rep goes.
- Too heavy to stabilise
- A dumbbell you cannot control makes every rep a recovery from the last one, and the erectors get a different job each time instead of the same one ten times. Pick a weight where every rep of the set looks alike.
- Starting with the good side
- Leading with the steadier leg and then falling short on the other one means one side banks more reps every week. Weaker side first, and the other side gets that number and stops.
Sets, reps and where it fits
BackMaxx defaults it to 3 sets of 8 to 10, and those are per side, so it is six working sets in total. It belongs in the second half of a session, after the heavy bilateral pull, when balance is the only thing left to spend. Lead with it and your standing leg is fresh but your concentration is not, and the reps get sloppy fast.
Progress by making the reps steadier before making them heavier: no touch-downs from the free foot, then a one-second pause at the bottom, then more dumbbell. If Symmetry is the zone the app keeps flagging, twice a week at 8 reps a side does more than one heavy day ever will — the Symmetry exercise list shows what else carries that tag.
No dumbbell? Do this instead
With no dumbbells around, run a Kettlebell Romanian Deadlift loaded in one hand on one leg. The bell hangs lower and closer to the shin than a dumbbell does, so the balance demand actually rises. A loaded backpack held by a single strap works too when the gym is your hallway.
Variations and similar exercises
- Romanian Deadlift
- Both feet planted and a barbell in your hands: far more load, no rotation to resist, and the place to build absolute strength in the hinge pattern.
- Dumbbell Romanian Deadlift
- Two dumbbells and two feet, keeping the free bottom range but removing the balance problem, which is what lets you go heavy.
- Bird Dog
- The unloaded cousin from all fours with the same hips-level rule at a fraction of the demand — the thing you do at the start of a back day, not the end.
Frequently asked questions
Why do single-leg RDLs feel so much harder than they look?
Because three jobs are stacked on one leg. The standing hip hinges under load, the same side stops the pelvis rotating open, and your foot manages balance underneath both. The dumbbell is small and the total demand is not, which is why the load never resembles what you use on two legs.
Should both sides get the same weight and reps?
Same reps, always — run the side that struggles first and hold the other one to that number. Same weight is usually right too, but if one side is clearly steadier, let the weight follow the harder side. Symmetry in BackMaxx is a visual read of left against right, and matched sets are what feed it.
Do I need to touch the dumbbell to the floor?
No, and reaching for the floor is the most common way this movement falls apart. Stop when the standing hamstring pulls tight or the hips start to open, which for most people is somewhere around mid-shin. Depth bought by rounding forward adds nothing to the set except a worse position.
Can I train single-leg RDLs at home?
Yes. One dumbbell, a kettlebell or a loaded bag is enough, plus about a body length of clear floor. It is one of the few home back exercises that stays genuinely difficult without a rack, because the balance keeps the demand high while the weight stays small.
Should the Single-Leg Romanian Deadlift be in your plan?
BackMaxx scores your lower back from one photo and builds the week around whatever is lagging — so the Single-Leg Romanian Deadlift only shows up when it is the right call.
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