How to do the Single Leg Extension
- Adjust the machine seat so your knee aligns with the pivot point.
- Place the pad on your lower shin, just above your ankle, and sit comfortably.
- Extend your working leg until your knee is nearly straight, feeling the effort.
- Slowly lower the pad back down to the starting position, maintaining control.
Full technique — 7 steps
- Adjust the seat so your knee lines up with the machine's pivot point.
- Place the roller pad across the front of your lower shin above the ankle.
- Sit tall with your back against the pad and hands holding the side handles.
- Keep one leg relaxed and extend the working leg until the knee is nearly straight.
- Squeeze the quadriceps at the top without kicking the weight up or snapping the knee straight.
- Lower the pad back down until the knee is bent and the weight stays controlled.
- Finish all reps on one side, then switch legs and match the same range.
Common mistakes
- Kicking the weight upward
- Snapping the knee straight
- Letting hips shift in seat
- Using different range per side
Form cues
- Align knee with pivot
- Sit back into pad
- Lift with the quad
- Match both sides
Substitutes by equipment
Same muscles, same movement — pick the version you have the gear for.
No equipment
- Bodyweight Single Leg Extension Same level
Where to start and where to go next
Same muscles, same movement. Too hard for now — step down; once it gets easy — step up.
- This exercise Single Leg Extension
- Harder Standing Cable Leg Extension
Quick answers
What muscles does the Single Leg Extension work?
Primary: Quads 10/10.
When should I do the Single Leg Extension in a workout?
Finisher. Goes last, once the heavy work is done. ≈ 6 min with rest.
How many sets and reps of the Single Leg Extension?
Muscle growth: 3–4 sets of 8–12 reps, rest 1 min 15 s, 2–3 reps in reserve. Endurance: 2–3 sets of 15–20 reps, rest 45 s, 3–4 reps in reserve.
What can I do instead of the Single Leg Extension?
No equipment: Bodyweight Single Leg Extension.
What is a harder version of the Single Leg Extension?
Standing Cable Leg Extension (Intermediate).
