Leg Curl: Lying vs Seated, Proper Form and Hamstring Tips

Squats and lunges train the quads hard, but the hamstrings need more than that. The leg curl is the most direct way to train knee flexion, one of the hamstrings' main jobs. It is simple, machine based and easy to progress.

Muscles Worked

The leg curl targets the hamstrings (biceps femoris, semitendinosus and semimembranosus). The calves assist, especially the gastrocnemius, which also crosses the knee.

Lying Leg Curl

1. Lie face down on the machine with the pad just above your heels.
2. Line your knees up with the machine's pivot point.
3. Grip the handles and press your hips into the bench.
4. Curl your heels toward your glutes as far as you can.
5. Pause, then lower slowly to almost straight.

Seated Leg Curl

Sit with the thigh pad locked down over your legs and the lower pad behind your ankles. Because your hips are bent, the hamstrings start in a more stretched position, and many lifters like the feel of this version. Curl down and back, pause, then return slowly.

Standing Cable Leg Curl

No machine? Attach an ankle strap to a low cable, face the stack and curl one heel up toward your glute. Bay Gear Co. ankle straps are $9.99 and also work for kickbacks and abductions.

Common Mistakes

• Hips lifting off the pad on the lying version.
• Jerking the weight with momentum.
• Short reps that skip full contraction or extension.
• Pointing the toes hard when you want maximum hamstring focus. A neutral or flexed foot is a good default.

Leg Curl vs Romanian Deadlift

Leg curls train the hamstrings at the knee. Hip hinges like the Romanian deadlift train them at the hip. A complete leg program includes both.

Sets and Reps

• 3 to 4 sets of 8 to 15 reps.
• Use a slow lowering phase of two to three seconds.
• Add a drop set on the last set if you want more volume.

Where Leg Curls Fit

Place them after your main squat or hinge on leg day. If you train legs twice a week, use the lying version one day and the seated version the other.

Knee Sleeves on Leg Day

Many lifters keep their knee sleeves on for the whole leg session for warmth and a snug feel. Bay Gear Co. knee sleeves are 9.5" long and 7mm thick for $59.99. Learn more in what do knee sleeves do.

Machine Setup Makes or Breaks the Leg Curl

Spend a moment adjusting the machine before your first set. Line up your knee joint with the machine's pivot point, which is usually marked by a colored dot. Set the ankle pad so it sits just above your heels, not on your calves. On the seated version, set the thigh pad down firmly so your legs cannot lift. A good setup makes the movement smooth and keeps the hamstrings working through the full range.

Foot Position and Hamstring Focus

With toes pointed (plantar flexed), the calves contribute less, which many lifters use to bias the hamstrings. With the foot flexed (toes toward the shins), the calves help more and you may move more weight. You can also turn your toes slightly in or out. Use a neutral foot most of the time and experiment to find what lets you feel your hamstrings best.

Tempo Recommendations

The hamstrings respond well to controlled lowering. Use one second to curl, one second to squeeze and three seconds to lower. This tempo makes moderate weights feel challenging and keeps the stack from slamming between reps.

Single-Leg Leg Curls

Most machines allow one-leg training. Single-leg work is useful for evening out strength differences between sides. Start with your weaker leg and match the reps with your stronger side.

Leg Curl Alternatives

• Nordic hamstring curls: a tough bodyweight option.
• Stability ball leg curls: lie on your back with heels on a ball and curl it toward you.
• Slider leg curls: same idea with sliders or towels on a smooth floor.
• Glute ham raise: combines hip extension and knee flexion on a special bench.
• Cable leg curls: stand facing the cable with an ankle strap.

Sample Hamstring Session

1. Romanian deadlift: 4 x 6 to 8
2. Seated leg curl: 3 x 10 to 12
3. Lying leg curl (single leg): 2 x 12 per side
4. Back extension: 2 x 15

Progression Tips

Use double progression. Pick a range like 10 to 15 reps. Stay at a weight until you hit 15 on all sets, then add one plate. Machines often have big jumps between plates, so use add-on weights or slower tempos to bridge the gap.

Leg Curls for Athletes

Many athletes include knee-flexion work like leg curls or Nordic curls in their programs alongside sprints and hinges.

Common Questions About Leg Curl Range

Curl as far as the machine allows and lower until your knees are almost straight. Avoid letting the stack touch down between reps to keep tension on the hamstrings for the whole set.

FAQ

Seated or lying leg curl?

Both work. Rotate them or pick the one you can train hardest with good form.

How heavy should leg curls be?

Choose a weight that lets you control the lowering phase for every rep.

Are leg curls necessary?

They are one of the simplest ways to train knee flexion directly, so most programs benefit from them.

Shop Leg Day Gear

Sleeves, wraps and ankle straps from Bay Gear Co., with free shipping on orders over $49 and a 30-day return policy.