How to do a Seated Leg Curl
The seated leg curl isolates the hamstrings by bending the knee against a pad. Good form pins the hips to the seat, curls the heels under with control, and resists the return. CalmArms grades range and control and counts every rep for you.
Muscles: Hamstrings · Calves (assist)
Demonstration: Seated Leg Curl
How to do it with clean form
- 1
Sit with hips pinned and the pad set just above your heels.
- 2
Curl your heels down and under the seat as far as they go.
- 3
Squeeze the hamstrings at the bottom of the curl.
- 4
Resist the eccentric on the way back — control beats speed.
Common seated leg curl mistakes CalmArms catches
Letting the hips lift off the seat to gain range.
Bouncing out of the bottom with momentum.
Short curls that never fully contract the hamstrings.
Rushing the return instead of resisting it.
How CalmArms grades the seated leg curl
CalmArms grades curl depth and eccentric control, so a slow, full curl scores higher than a bounced partial.
Variations graded
Grade your seated leg curl on your next set.
Prop your phone and lift. CalmArms counts every rep and grades your form A–F, hands-free — on-device, no video uploaded.