Seated Leg Curl
The seated leg curl isolates your hamstrings on a machine that locks your hips and thighs in place, so the only thing moving is your lower leg. It builds hamstring strength and size without your lower back or glutes stepping in to help, which makes it a common finishing move after squats, deadlifts, or lunges. The machine sets the path for you, so it is an easy one to learn on your first few gym visits.
Why it works
Your hamstrings cross both the hip and the knee, so most other leg exercises only train part of their job. The seated leg curl isolates the knee-flexion half of that job: the pad rests against your lower shins and you pull it toward the seat, shortening the hamstrings without the hips extending at the same time. The machine's back pad and thigh restraint keep your hips still, so tension stays on the hamstrings from the first inch of the pull to the last instead of spreading into the glutes and lower back the way a hip-hinge movement would.
Set up
- Adjust the seat back so your knees line up with the machine's pivot point.
- Slide your lower shins under the top pad, just above your ankles.
- Set the thigh pad snug across your legs so your hips stay locked against the seat.
- Grip the side handles and press your back flat against the pad.
How to do it
- Curl your lower legs down and back, pulling the pad toward the underside of the seat.
- Squeeze your hamstrings hard at the bottom of the movement, where your knees are most bent.
- Pause for a second at full contraction before reversing direction.
- Straighten your legs back to the start under control, without letting the weight stack drop.
- Stop just short of locking your knees out completely to keep tension on the hamstrings.
- Repeat for the full set without rocking your hips off the seat.
Form cues
- Hips glued to the seat the whole rep.
- Pull with your heels, not your toes.
- Squeeze at the bottom before you release.
- Lower the weight, don't let it drop.
Breathing: Exhale as you curl the pad down toward the seat, inhale as you straighten your legs back out.
Common mistakes
Letting the hips lift off the seat to help drag the weight down.
Fix: Keep your glutes pressed into the pad; if you need to arch or lift to finish a rep, the weight is too heavy.
Using short, bouncy reps instead of a full range of motion.
Fix: Curl all the way down to a full hamstring contraction and straighten out fully at the top of each rep.
Letting the weight stack slam down on the return.
Fix: Lower the pad on a slow three-count instead of letting gravity do the work.
Pointing the toes hard through the whole set.
Fix: Keep your ankles relaxed and neutral so your calves aren't doing the hamstrings' job.
How to program it
- This is single-joint accessory work, so three or four sets of 10 to 15 reps once or twice a week adds hamstring volume without dragging out recovery from your bigger lower-body lifts.
- Save it for after squats, deadlifts, or lunges in a session; pre-fatiguing the hamstrings before those bigger pulling movements tends to shortchange the main lift.
- A slow three-second lowering phase adds real hamstring tension without needing more weight on the stack.
- If your knees feel pinchy at full contraction, stop a few degrees short of maximum curl instead of pushing through it.
Safety notes
- Keep the thigh pad tight enough that your hips can't lift during the pull; that lift shifts strain toward your lower back.
- Choose a weight that lets you complete the full range of motion under control, not one that forces you to swing or arch to finish a rep.
Exercise profile
- Force
- Pull
- Mechanics
- Isolation
- Category
- Strength
Frequently asked questions
How many sets and reps should I do for the seated leg curl?
Three or four sets of 10 to 15 reps works well for most people, done once or twice a week alongside your main lower-body lifts.
Is the seated leg curl better than the lying leg curl?
Neither is better outright. The seated version tends to stretch the hamstrings a bit more at the top because your hips stay bent, while the lying version keeps your hips extended. Use whichever machine your gym has.
What can I do if my gym doesn't have a seated leg curl machine?
A lying leg curl machine trains the same movement from a prone position, and a stability ball leg curl works with just bodyweight when no machine is available.
Why do I feel this more in my calves than my hamstrings?
Pointing your toes hard recruits your calves to help with the pull. Keep your ankles relaxed and let your heels lead the movement instead.