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Leg Extension
A single-joint machine exercise that isolates the quadriceps through knee extension against a padded resistance arm.
LegsMachineKnee extension
GoLightWeight medialeg-extension
Demonstration coming soon
Primary
Quadriceps
Secondary
Equipment
Machine
Pattern
Knee extension
Setup
- 01Set the seat so the knee joint lines up with the machine's pivot.
- 02Adjust the pad to rest just above the ankles, not on the foot.
- 03Sit back with hips and lower back against the pad.
- 04Hold the handles and brace before the first rep.
Execution
- 01Start with knees bent around 90 degrees and shins behind the pad.
- 02Extend the knees to lift the pad until the legs are nearly straight.
- 03Pause briefly at the top without slamming into lockout.
- 04Lower under control back to the bent-knee start.
Checkpoints
- -The knee pivot stays aligned with the machine axis.
- -Hips and back stay against the pad throughout.
- -Movement comes only from the knees.
- -The lowering phase stays controlled, not dropped.
Common mistakes
- -Swinging the torso to fling the weight up.
- -Using a load that forces the hips off the pad.
- -Bouncing out of the bottom instead of controlling it.
- -Snapping into hard lockout at the top.
Programming notes
- -Use 3 to 4 sets of 10 to 20 reps.
- -Higher reps and a slow eccentric suit this isolation lift well.
- -Use as quad-focused accessory work after squats or leg press.
Related exercises
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