What you'll gain

• Isolates knee flexion so the hamstrings work without the quads or hips joining in.

• The seated position holds the hamstrings at a longer working length.

• Machine guidance makes it straightforward to load safely for newer lifters.

Step-by-Step Instructions

1. 1

   Set the seat and back pad so your knees line up with the machine's pivot.

2. 2

   Sit back with your thighs flat and the lap pad locked down over them.

3. 3

   Rest your lower legs on top of the roller, contact just above the ankles.

4. 4

   Grip the side handles and press your hips into the seat.

5. 5

   Curl your heels down and back toward the seat as far as the machine allows.

6. 6

   Return slowly until your knees are almost straight, then repeat.

Common Mistakes

• Letting the hips lift off the seat, which turns the curl into a partial hip movement.

• Locking the knees out on the return, which drops tension off the hamstrings.

• Setting the roller on the calf instead of just above the ankle, which shortens the lever.

• Snapping the weight back, which wastes the eccentric and rattles the stack.

About This Exercise

The seated leg curl is knee flexion against a machine. You sit with your thighs pinned under a lap pad, the roller resting just above your ankles and your knees lined up with the machine's pivot, then curl your heels down and back toward the seat. Sitting keeps the hips flexed, which holds the hamstrings at a longer working length than the lying version does. Sloppy technique on the lying version drags the lumbar extensors into the work; the seated setup, with the spine against a backrest, largely removes that risk. In a catalog this is the standard machine hamstring entry. It fits leg day templates, machine-only circuits for gym floor apps, knee-friendly programming where a loaded hinge is not appropriate, and equipment filters where buyers expect a selectorized option.

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