Machine Leg Extension 10s · no sound

Machine Leg Extension

A seated knee-extension machine that isolates the quads through a fixed range — the most direct quad-builder in the gym.

Primary muscle
Quads
Equipment
Machine
Difficulty
Beginner
Movement
Isolation
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How to do it

  1. Sit on the machine and adjust the back pad so your knees line up with the machine's pivot point.
  2. Place your shins behind the roller pad with the pad sitting just above the ankle joint, not on the foot.
  3. Grip the side handles, brace your core, and press your back firmly into the pad.
  4. Extend your knees smoothly until the legs are straight, squeezing the quads hard at the top.
  5. Hold the lockout for a beat, keeping the toes pulled up toward the shins for max quad engagement.
  6. Lower the pad slowly over 2 to 3 seconds back to the start, never letting the stack slam down.

Common mistakes

  • Slamming the legs straight with momentum, then dropping the weight fast, which removes most of the loading.
  • Setting the seat wrong so the knee pivot doesn't match the machine, which puts shear stress on the joint.
  • Lifting the hips off the seat to muscle the weight up, which shifts work away from the quads.
  • Cutting the range short on the bottom half, which trains only the easy top portion of the lift.

Muscles worked

Primary
Quads

Good to know

What muscles does the Machine Leg Extension work?
Mainly the quads.
What equipment do you need for the Machine Leg Extension?
It uses a machine. Without it, the Wall Sit trains the same muscles the same way.
Is the Machine Leg Extension good for beginners?
GymVim rates it beginner.

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