Seated Leg Curl is best learned as a controlled sequence, not a race from the first position to the last. The exercise mainly trains semitendinosus, while glutes and erector spinae help support and control the movement. You will use a seated leg curl machine while working from seated at the machine.
What makes a good Seated Leg Curl repetition?
Control the hip and knee angles so tension stays on the back of the thighs throughout the rep. The movement has a clear, scalable pattern. Start light, learn the positions in order, and progress only while every repetition remains controlled.
Muscles worked
Primary
Semitendinosus
These muscles should carry most of the intended work when the setup and movement path stay consistent.
Supporting
Glutes and Erector spinae
These muscles assist the movement or help keep the rest of your position steady.
Set up before you move
Start from seated at the machine. Use the prescribed grip: supinated. Check that a seated leg curl machine is secure and adjusted before you begin.
Step-by-step tutorial
How to do Seated Leg Curl
- 1
Set the starting position
Set the knees at the machine or bench pivot, secure the ankles, brace the trunk, and begin Seated Leg Curl with the hips aligned to the support.
Breathing: Breathe steadily; do not hold your breath.
- 2
Perform the effort phase
Exhale and flex the knees, drawing the heels toward the body while preventing the hips from lifting or the lower back from arching.
Breathing: Exhale through the effort.
- 3
Control the end position
Control the shortest hamstring position that can be reached without losing hip or trunk alignment.
Breathing: Breathe steadily; do not hold your breath.
- 4
Return under control
Inhale and extend the knees slowly, resisting the load until the hamstrings return to a lengthened starting position.
Breathing: Inhale through the controlled return.
Common mistakes to avoid
Starting before the setup is stable
Do not rush the first position. Set the knees at the machine or bench pivot, secure the ankles, brace the trunk, and begin Seated Leg Curl with the hips aligned to the support. Make that setup feel repeatable before adding speed or resistance.
Letting the working position drift
Keep your seated at the machine setup consistent through the rep and maintain the supinated. If another part of the body has to swing or twist, reduce the load or range.
Rushing the return
The return is part of the exercise, not a pause between efforts. Inhale and extend the knees slowly, resisting the load until the hamstrings return to a lengthened starting position.
Forcing a range you cannot control
Use the Seated Leg Curl setup, maintain controlled joint alignment, and stop if the movement causes pain.
Sets, reps, and rest
Start with 2–4 sets of 10–15 smooth repetitions. Rest 45–90 seconds between sets. Use enough resistance to feel the target muscles without shortening the range or borrowing momentum from the rest of your body.
Treat this as a starting framework. Your load and volume should match your current technique, recovery, and training plan.
Seated Leg Curl questions
Is Seated Leg Curl suitable for beginners?
Seated Leg Curl is classified as a beginner-level movement in this guide. The movement has a clear, scalable pattern. Start light, learn the positions in order, and progress only while every repetition remains controlled.
What muscles does Seated Leg Curl work?
Seated Leg Curl primarily works semitendinosus, with glutes and erector spinae assisting or stabilizing the movement.
What equipment do I need for Seated Leg Curl?
You need a seated leg curl machine. Set everything up securely before the first repetition.
