Description
The seated leg curl trains the hamstrings from a hip-flexed, bilateral seated position, curling both legs together against a padded lever to flex the knee through a controlled arc. Sitting upright with your hips already bent puts the hamstrings in a lengthened starting position at the hip, which research suggests biases growth toward the upper hamstring near the glutes — a region that lying, prone leg curls and unilateral seated curls train less directly. Because both legs work together, it also allows heavier total loading than a single-leg seated curl, making it a strong bilateral complement to unilateral hamstring work.
How to perform
- Set the machine to your leg length Adjust the seat and lever pad so your knees line up with the machine's pivot point and the pad rests just above your ankles.
- Sit back and secure the thigh pad Sit upright with your back against the pad and secure the thigh pad down over your legs according to the machine's setup.
- Grip the handles and brace Hold the side handles for stability and brace your core, keeping your hips pinned to the seat throughout the set.
- Curl your heels down and back Flex your knees to curl the pad down and back, driving through your heels until your legs reach close to full flexion.
- Squeeze at full flexion Pause for a moment at the bottom of the curl, feeling the contraction through your hamstrings without lifting your hips off the seat.
- Extend back to the start under control Straighten your legs back out slowly, resisting the weight the entire way rather than letting it snap back.
Tips
- Keep your hips pinned to the seat throughout the set — lifting your hips to help curl the weight shifts tension away from the hamstrings and toward your lower back.
- Point your toes slightly toward your shins (dorsiflex) during the curl — this can increase hamstring recruitment compared to pointed toes.
- Control the return phase just as deliberately as the curl itself — the eccentric portion is where much of the growth stimulus for hamstrings comes from.
- If your calves cramp before your hamstrings fatigue, adjust your foot position slightly or reduce the load rather than pushing through cramping.
Common mistakes
- Lifting the hips off the seat during the curl — this is the most common form break and shifts stress toward the lower back instead of the hamstrings.
- Using a weight so heavy the eccentric collapses — dropping the pad back to the start quickly skips the lengthened-tension stimulus that drives hamstring growth.
- Stopping the curl short of a full range — a shortened range under-trains the hamstrings at the deepest part of the contraction; curl as far as comfortable control allows.
- Gripping the handles so hard your upper body tenses excessively — over-tensing unrelated muscles doesn't add benefit and can distract from focusing on the hamstrings.
Recommended sets & reps
| Sets | Reps | RIR | |
|---|---|---|---|
| Strength | 3–4 | 8–10 | 1–2 |
| Hypertrophy | 2–3 | 10–15 | 1–2 |
| Endurance | 2–3 | 15–20 | 2–3 |
| Power | 3 | 8–10 | 2–3 |
These ranges are working sets only — add 1–2 progressive warm-up sets before each working set. Pair with 2× per week frequency to reach ~10–20 weekly sets per muscle group, the volume range supported by current evidence (Schoenfeld 2017, Pelland 2025).
Benefits
Trains the hamstrings from a hip-flexed seated position, which places the muscle in a lengthened starting position at the hip and may bias growth toward the upper hamstring near the glute-hamstring junction. Allows heavier bilateral loading than a single-leg seated curl since both legs share the work, making it efficient for accumulating hamstring volume in less time. Complements hip-hinge movements like Romanian deadlifts and hip thrusts by directly targeting the knee-flexion function of the hamstrings, filling a role those hip-dominant lifts don't cover. A reliable isolation exercise for building hamstring size and knee-flexion strength with minimal technical demand.
Frequently asked questions
Seated leg curl vs lying leg curl — which is better for hamstrings?
Both are effective; the seated version trains the hamstrings from a hip-flexed position that some research suggests emphasizes the upper hamstring, while the lying (prone) version trains from a hip-extended position that may emphasize the lower hamstring near the knee. Including both across a program covers the muscle more completely.
Should I point or flex my toes during leg curls?
Pointing your toes toward your shin (dorsiflexion) can slightly increase hamstring activation by reducing calf involvement, though the difference is modest — use whichever foot position feels most stable and comfortable.
Why do my hips lift off the seat during the curl?
This usually happens when the weight is too heavy for strict form. Reduce the load until you can complete the full range with your hips pinned to the seat for every rep.
How often should I train hamstrings with leg curls?
2 times per week works well for most lifters when paired with hip-hinge movements like Romanian deadlifts, giving the hamstrings varied stimulus across both knee-flexion and hip-extension patterns.
Educational guidance only — not a substitute for in-person coaching. Train within your ability and use a spotter for heavy attempts.
