Legs · Hip Hinge

Romanian Deadlift

Also known as: RDL ／ Romanian Deadlift (RDL)

Joint action: Hip extension/flexion (hip hinge); the knee stays in slight, roughly fixed flexion
Plane: Primarily the sagittal plane
Chain: Closed kinetic chain (CKC; the feet stay planted)
Body part: Legs
Equipment: Barbell

Target muscles

Front

Back

Prime moverGluteus maximus, Hamstrings
SynergistAdductors (adductor magnus)
StabilizerErector spinae (lumbar), Latissimus dorsi, Trapezius / upper back, Forearm flexors

A conceptual map coloring representative muscles by role. Varies by individual and form; deep muscles may not be shown.
Muscle map: body-muscles (Apache-2.0)

Definition

The Romanian deadlift (RDL) is a posterior-chain exercise in which you lower a barbell through a hip hinge — pushing the hips back — and stand up by extending the hips. Unlike a conventional deadlift, you do not reset from the floor; the knee stays in slight, roughly fixed flexion while the hips drive the movement. Range of motion is set by hamstring flexibility and by how far you can keep the spine neutral. It is often chosen to build the hamstrings and gluteus maximus, or to learn the hip-hinge pattern.

How it differs from a conventional deadlift

A conventional deadlift starts concentrically from the floor with substantial knee flexion and extension, and relatively more quadriceps involvement. The RDL starts with the lowering (eccentric) phase from the top, with little knee movement, biasing the hip extensors (hamstrings and gluteus maximus). Because the target and the pattern being trained differ, they are treated as separate exercises.

Anatomy: muscles involved

Colors in the muscle map correspond to the roles below (prime = red / synergist = blue / stabilizer = amber / antagonist = gray).

Role	Muscle	Action in this exercise
Prime mover	Gluteus maximus	A prime mover of hip extension — standing up out of the hinge.
Prime mover	HamstringsMainly the biarticular muscles (biceps femoris long head, semitendinosus, semimembranosus)	Drive hip extension and are loaded eccentrically as they lengthen on the way down; they are the main stretch target of this exercise.
Synergist	Adductors (adductor magnus)	The posterior fibres of the adductor magnus assist hip extension.
Stabilizer	Erector spinae (lumbar)	Works isometrically to hold the spine in a neutral position throughout the hinge; it holds posture rather than 'pulling' the movement.
Stabilizer	Latissimus dorsi	Keeps the bar drawn in toward the body and helps maintain trunk tightness.
Stabilizer	Trapezius / upper back	Stabilises the shoulder girdle and holds the upper back isometrically so it does not round under load.
Stabilizer	Forearm flexors	Maintain grip on the bar; at heavy loads grip often fails before the working muscles.

Muscle length & resistance curve

Resistance curve

Conceptual · not to scale

Setup: Barbell ／ Overhand (or mixed / hook grip)

Demand on the hip extensors peaks at the bottom, where the torso is most inclined and the bar sits farthest from the hips (the hamstrings are most lengthened), and falls toward the upright lockout. It is a classic case of loading the stretched position. This is a conceptual figure with no scale.

Form variables & evidence

Variable	Condition	Effect	Evidence
Range of motion (depth of the hinge)	Lower until you feel a hamstring stretch, within the range where you can keep a neutral spine	Greater hip flexion loads the hamstrings at longer muscle lengths. This aligns with the principle that training the hamstrings at longer lengths produced greater hypertrophy, but the effect of RDL depth on hypertrophy has not been tested directly.The evidence comes from a leg-curl study (seated vs prone) that manipulated muscle length, not a comparison of RDL depths (this is an extrapolation). Range is set by individual hamstring flexibility and the limit of a neutral spine — lowering 'to the floor' is not inherently correct.	HypertrophyLongitudinal trialConf. Low
Knee angle (RDL vs stiff-legged)	Hold a slight bend vs keep the knees nearly straight	The straighter the knee, the greater the hamstring stretch, but the demand on the lower back can also change. Holding a slight bend defines the RDL; straightening further shifts it toward a stiff-legged deadlift.	Joint kinematicsBiomechanicsConf. Low
Movement initiation (hip-led)	Initiate by pushing the hips back vs bending the knees into a squat	Initiating by sending the hips back keeps the emphasis on the posterior chain (hamstrings, glutes). If it collapses into a knee-led squat, the intended target is lost.This is a technical consensus about which muscles work, not a direct measurement of long-term differences in hypertrophy.	Muscle activationExpert consensusConf. Low
Spinal position (holding neutral)	Keep the lumbar and thoracic spine neutral vs let it round	It is generally coached to keep a neutral spine. Biomechanically, flexing the spine is thought to change how load is distributed across tissues. A practical guideline is to keep range within where neutral can be maintained.The link between spinal flexion and injury is not simple and varies widely between individuals; safety-related judgements are not asserted here.	Joint kinematicsBiomechanicsConf. Low

Evidence is shown by 'what was measured (outcome / study type)' and 'confidence' separately. The best choice varies by individual and goal.

Common misconceptions

Myth 1

The RDL is a lower-back (erector spinae) exercise

What research shows

The prime movers are the hip extensors (hamstrings, gluteus maximus); the erector spinae works mainly as an isometric stabiliser holding a neutral spine. It is not a movement where you 'lift with the lower back'.

Confidence

Verdict:A misconception. The lower back is a stabiliser here, not a prime mover.

Myth 2

The deeper you lower — all the way to the floor — the better, always

What research shows

There is a principle that loading at longer muscle lengths favours hypertrophy, but RDL range is set by hamstring flexibility and by keeping the spine neutral. Lowering past your flexibility by rounding the back departs from the goal (stretch loading of the posterior chain).

Confidence

Verdict:It depends. The principle is to reach maximal stretch within the range where you can keep a neutral spine.

Safety

•Warm up properly and learn the hip-hinge pattern with light loads before adding weight.
•Range of motion varies with individual hamstring flexibility; work within the range where you can keep the spine neutral and controlled.
•Stop and consult a professional if you feel sharp pain or discomfort in the lower back, hamstrings, or knees.
•If you have a history of lower-back problems, adjust range of motion and load especially carefully.

This information is for general educational purposes and is not medical advice.