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Leg Curl
A machine knee-flexion exercise that isolates the hamstrings with consistent tension and minimal balance demand.
LegsMachineKnee flexion
Primary
Hamstrings
Secondary
GastrocnemiusPopliteus
Equipment
Machine
Pattern
Knee flexion
Setup
- 01Set the back pad so the knees line up with the machine pivot.
- 02Place the ankle pad just above the heels with legs extended.
- 03Lower the thigh pad to lock the hips down.
- 04Grip the handles and brace before curling.
Execution
- 01Curl the heels toward the glutes by flexing the knees.
- 02Keep the hips and thighs pinned to the pads.
- 03Pause briefly at the deepest comfortable flexion.
- 04Lower under control until the legs are nearly straight.
Checkpoints
- -Hips stay down on the pad through the range.
- -Movement comes only from the knees.
- -The lowering phase stays controlled, not dropped.
- -Both legs curl evenly.
Common mistakes
- -Lifting the hips to gain extra range.
- -Using momentum to swing the pad up.
- -Cutting the bottom range short.
- -Setting the ankle pad too high on the calf.
Programming notes
- -Use 3 to 4 sets of 8 to 15 reps.
- -A slow eccentric increases hamstring tension at lighter loads.
- -Pair with leg extensions or squats for balanced thigh work.
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