What is the difference between seated and lying leg curls?

The seated leg curl places your hips in flexion, which pre-stretches the hamstrings and can increase activation compared to the lying variation. Both are effective, but the seated version may allow for a greater range of motion and peak contraction.

Should I use a full range of motion on seated leg curls?

Yes, using a full range of motion from full knee extension to maximum flexion ensures complete hamstring development and better muscle fiber recruitment. Avoid partial reps unless you are working around an injury or using them as an advanced technique.

How do I prevent cramping in my hamstrings during seated leg curls?

Cramping often results from dehydration, inadequate warm-up, or jumping to heavy weight too quickly. Ensure you are hydrated, perform lighter warm-up sets, and gradually increase load while maintaining controlled form.

Seated Leg Curl (Machine)

The seated leg curl is a machine-based isolation exercise that targets the hamstrings by curling the weight pad toward your glutes while seated. It suits lifters of all levels who want to build hamstring strength and size with a stable, controlled movement pattern.

Muscle group: Legs
Primary muscles: hamstrings
Equipment: Machine

How to do the Seated Leg Curl (Machine)

Adjust the seat so your knees align with the machine's pivot point and the lower pad rests just above your heels.
Sit with your back flat against the pad, grip the handles, and position your thighs under the upper restraint pad.
Curl your heels toward your glutes by bending your knees, contracting your hamstrings fully at the bottom.
Pause briefly at peak contraction, then return to the starting position under control without letting the weight stack touch.

Form tips

Keep your hips pressed firmly into the seat throughout the movement to prevent lower back involvement and maintain tension on the hamstrings.
Control the eccentric portion by resisting the weight on the way up rather than letting it pull your legs back quickly.
Point your toes straight or slightly inward to maximize hamstring engagement and avoid shifting tension to the calves.

Common mistakes

Lifting your hips off the seat during the curl reduces hamstring tension and can strain the lower back.
Using momentum by jerking the weight down turns the exercise into a less effective, higher-injury-risk movement.
Setting the pad too high on the calf shifts emphasis away from the hamstrings and limits range of motion.

Sets and reps

For hypertrophy, perform 3 to 4 sets of 8 to 15 reps with moderate weight and controlled tempo; for strength, use 3 to 5 sets of 5 to 8 reps with heavier load.

Track the Seated Leg Curl (Machine) in Gym Track

Log every set in seconds, see your last session's weight and reps as you train, and get a new PR flagged automatically. Free on iPhone and Android.

Get the app

Frequently asked questions

What is the difference between seated and lying leg curls?: The seated leg curl places your hips in flexion, which pre-stretches the hamstrings and can increase activation compared to the lying variation. Both are effective, but the seated version may allow for a greater range of motion and peak contraction.
Should I use a full range of motion on seated leg curls?: Yes, using a full range of motion from full knee extension to maximum flexion ensures complete hamstring development and better muscle fiber recruitment. Avoid partial reps unless you are working around an injury or using them as an advanced technique.
How do I prevent cramping in my hamstrings during seated leg curls?: Cramping often results from dehydration, inadequate warm-up, or jumping to heavy weight too quickly. Ensure you are hydrated, perform lighter warm-up sets, and gradually increase load while maintaining controlled form.

More leg exercises

All leg exercises →