RIRLift app icon RIRLift

Exercises

Seated leg curl: how to set up the machine and curl with good form

Published October 19, 2026

The seated leg curl is a machine exercise where you sit upright and bend your knees against a pad to work your hamstrings. Line your knees up with the machine's pivot, set the lower pad just above your ankles, lock the thigh pad down, then curl your heels under you and let them back out slowly. Sitting puts your hamstrings on more stretch than the lying version.

Your last seated leg curl set

How to do the seated leg curl

Sitting with your hips bent stretches the hamstrings at the top of every rep, which makes the seated curl one of the best machines for building them. The thigh pad holds you in place, so there is no low-back strain and no cheating with your hips.

Steps

  1. Adjust the back pad so the side of your knee lines up with the machine's pivot point when you sit all the way back.
  2. Set the lower roller so it sits on the back of your lower legs, a little above the ankle, then lower the thigh pad until it presses firmly on your legs just above the knees.
  3. Hold the side handles, sit tall against the back pad and point your toes straight up.
  4. Curl your heels down and back under the seat as far as the machine allows, and hold the bottom for a moment.
  5. Let your legs straighten slowly until they are almost fully out, keeping the stack from touching down before the next rep.

Cues

  • Knees on the pivot
  • Pin the thigh pad tight
  • Slow on the way up

Common mistakes

  • Knees not lined up with the pivot: the pad slides along your legs and the rep feels awkward; move the back pad until the joint and pivot match.
  • Thigh pad left loose: your hips lift off the seat as the set gets hard; tighten it so your legs cannot rise.
  • Cutting the stretch short: let the legs straighten nearly all the way each rep, since that stretched position is the point of the seated version.

Swap for: Lying Leg Curl, Romanian Deadlift, Nordic Hamstring Curl

Muscles the seated leg curl works

The seated leg curl works all three hamstring muscles at the back of the thigh, and the calves help a little as the knee bends. Because your hips are bent, the hamstrings start each rep stretched, which is why many lifters feel this version more than the lying one. It does very little for the glutes.

Sets, reps and reps in reserve for the seated leg curl

GoalSets × repsRIRRest
Build muscle 3–4 × 8–12 1–2 90 s
Take the last set to 1 RIR and lower every rep slowly.
Higher-rep finish 2–3 × 12–20 0–1 60–90 s
Works well as the last exercise of a leg day.
First weeks on the machine 2–3 × 10–15 2–3 60–90 s
Learn the setup first, then add weight when you hit the top of the range.

Seated leg curl variations

  • Single-Leg Leg Curl start position

    Single-Leg Leg Curl

    Curl one leg at a time when one hamstring is weaker or you want to fix a side-to-side difference.

    Build a session with it
  • Cable Leg Curl start position

    Cable Leg Curl

    Use an ankle strap on a low cable when the seated machine is taken.

    Build a session with it
  • Band Leg Curl start position

    Band Leg Curl

    Loop a band around a post and curl lying face down when you train at home.

    Build a session with it

Seated leg curl alternatives

Other leg curls

  • Lying Leg Curl start position

    Lying Leg Curl

    Lie face down when you want a curl that is harder at the top and easier at the stretched end.

    Build a session with it
  • Nordic Hamstring Curl start position

    Nordic Hamstring Curl

    Kneel and lower your body forward when you have no machine and want a very hard hamstring curl.

    Build a session with it
  • Stability Ball Leg Curl start position

    Stability Ball Leg Curl

    Roll a ball in with your heels from a bridge when you train at home.

    Build a session with it

Hip hinges

  • Romanian Deadlift start position

    Romanian Deadlift

    Hinge with a barbell when you want the hamstrings trained at the hip as well as the knee.

    Build a session with it
  • Dumbbell Romanian Deadlift start position

    Dumbbell Romanian Deadlift

    Use dumbbells for the same hinge at home or with lighter weights.

    Build a session with it

Seated vs lying leg curl

Both curl your knees against a pad, but your hip position changes the stretch. Sitting bends your hips, so the hamstrings start long and work hard in the stretched part of the rep. Lying face down keeps your hips straight, so the hardest part moves toward full knee bend.

If you have both machines and only time for one, pick the seated curl for size. The lying curl is a good second choice or a swap when the seated one is busy. Which feels harder depends on the machine, so judge your sets by reps in reserve, not by the number on the stack.

Setting up the seated leg curl machine

Three adjustments matter: the back pad, the lower roller and the thigh pad. Move the back pad until your knee joint lines up with the pivot. Slide the roller so it sits above your ankle, not on your heel or calf. Bring the thigh pad down until you can't lift your legs. Note the settings in your log so the next session starts in the same place.

Do leg curls work your glutes?

Very little. A leg curl bends the knee, and the glutes work at the hip. If you want the back of your legs and your glutes trained together, add a hip hinge such as a Romanian deadlift or a hip thrust alongside the curl.

Questions

How many sets and reps for seated leg curls?

Three to four sets of 8 to 12 reps, stopping 1 to 2 reps short of failure, works well for most people. Use 12 to 20 reps for a finisher.

Are seated leg curls beneficial?

Yes. They train the hamstrings through a long stretch with no load on your back, which makes them one of the best isolation lifts for the back of the thigh.

Which is harder, seated or lying leg curl?

It depends on the machine. The seated curl is usually hardest near the start, where the hamstrings are stretched, and the lying curl near full knee bend.

What is a Nordic leg curl?

A bodyweight curl where you kneel with your ankles held down and lower your body toward the floor slowly using your hamstrings. It is much harder than a machine curl.

What are some variations of seated leg curls?

Single-leg seated curls, cable curls with an ankle strap, and band curls at home all train the same knee bend.

Do leg curls make your glutes bigger?

Not much. Leg curls work the hamstrings; the glutes need hip work like hip thrusts or Romanian deadlifts.