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§ L · Exercises · QuadricepsUpdated 6/2026

Lever One Leg Extension

Builds the quadriceps and improves knee extension strength. It helps with squats, stairs, and better leg control.

Muscle group
Quadriceps
Equipment
Machine
Exercise type
Isolation
Technique
Basic technique
One side at a time

Muscles worked

§ 01 · Muscles
Primary muscle
Quadriceps

How to perform

§ 02 · Steps
  1. 01

    Adjust the leg extension machine so that your knee joint is aligned with the machine's pivot point and the roller pad rests against the front of your ankle.

  2. 02

    Sit with your back firmly against the backrest, brace your core, and place one leg in the working position while the other leg rests to the side.

  3. 03

    Extend your knee under control until your leg is almost straight, and squeeze your quadriceps briefly without lifting your hips off the seat.

  4. 04

    Slowly lower the weight back to the starting position by bending your knee, keep the movement controlled, and maintain the same alignment between your knee and toes.

  5. 05

    Complete the desired repetitions with the same leg, then switch legs only after finishing the set.

Beginner's guide

§ 03 · Guide
What it works

Builds the quadriceps and improves knee extension strength. It helps with squats, stairs, and better leg control.

What it should feel like

You should feel it in your quads. It should not feel like strain in your lower back, hips, or painful pressure in the knee.

Most common mistake

A common mistake is using your hips to swing the weight or letting the stack slam down. Lift and lower with control, keep your back against the pad.

How to get started at the gym

§ 04 · SisuLift

Lever One Leg Extension is ready to go in the SisuLift exercise library. The app builds you a program, suggests starting weights and shows this same animation during your workout at the gym.

  • ·A ready training program based on your goal
  • ·Starting weight suggestions and automatic progression
  • ·Set logging and rest timer at the gym
Download on the App StoreGet it on Google Play
SisuLift app workout view

Tips

§ 05 · Tips

Keep the movement strictly as a knee extension and avoid using hip movement to generate momentum. Use a controlled lowering phase and stop the movement before the weight stack slams.

The single-leg leg extension isolates the quadriceps and helps correct strength imbalances between legs.

More exercises: Quadriceps

§ 06 · Same muscles

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