Horizontal Unilateral Leg Press

Muscles worked

Quadriceps

Primary muscle

Rectus femoris

Equipment

Machine

Movement pattern

Lower body

Difficulty

Intermediate

What it is for

HypertrophyStabilityStrength

Watch the full tutorial

• Placing the foot in the center of the platform. With the foot off the line of the hip, the pelvis twists in the seat and the knee drifts inward. Set the foot in line with the hip on the same side.
• Pushing with the free leg on the floor or the frame. That hidden assist shares the load and takes work from the training leg. Let the free foot rest without force, or lift it if you struggle not to push.
• Lowering until the hip lifts off the seat. When the thigh gets too close to the chest, the pelvis rolls and the lower back rounds under load. Stop where the glute is still on the pad, even if the range is shorter.
• Letting the knee cave inward as you push. With the load on one side and fatigue building, the hip abductors stop holding the alignment. Keep the knee over the line of the foot and reduce the weight if you cannot.

Which muscles does the horizontal unilateral leg press work?

The quads of the pushing leg do almost all the work extending the knee, and the gluteus maximus and adductors extend the hip from the bottom. The hamstrings contribute little. What changes compared with the two-leg version is stability: with force entering on one side only, the abs and obliques stop the pelvis from twisting in the seat, and the hip abductors keep the knee tracking over the foot.

Single-leg or two-leg leg press: when is it worth using one leg?

Use one leg when one side clearly pushes harder than the other, when the total load of the two-leg press is already uncomfortable for the back, or when you want more range: without the other leg in the way, the thigh comes closer to the chest. Two legs move more weight in less time, so the bilateral press remains the base for building strength and size; the single-leg version is added as a second exercise.

How many sets and reps for the horizontal unilateral leg press?

A common starting point is 3 sets of 10 to 15 reps per leg, leaving 1 to 3 reps in reserve. Start with the weaker leg and match that number of reps with the other one. The load usually ends up below half of the two-leg press, because the other leg is no longer stabilizing: choose the weight by the last rep, not by the stack. It usually comes after the squat or the two-leg press.

Where should you place the foot on the single-leg horizontal leg press?

In line with the hip on the same side, not in the center of the platform: if the foot drifts to the middle, the pelvis twists and the knee tends to cave inward. Foot height changes the split: at mid-height quads and glute share the work; higher loads the glute more; lower, the quads. Keep the whole foot flat and leave the other leg relaxed on the floor or the frame, without pushing.