How to Do Single-Leg Leg Extension
Start and end of one clean rep of Single-Leg Leg Extension.
Quick facts
| Primary muscle | Quads |
|---|---|
| Secondary muscles | — |
| Equipment | Machine |
| Category | Strength |
How to perform Single-Leg Leg Extension
- Seat yourself in the machine and adjust it so that you are positioned properly. The pad should be against the lower part of the shin but not in contact with the ankle. Adjust the seat so that the pivot point is in line with your knee. Select a weight appropriate for your abilities.
- Maintaining good posture, fully extend one leg, pausing at the top of the motion.
- Return to the starting position without letting the weight stop, keeping tension on the muscle.
- Repeat for the desired number of repetitions.
Muscles worked
- Quads (primary): extends the knee to drive squats, lunges and jumps.
Sets & reps by goal
| Goal | Sets × reps | Load | Rest |
|---|---|---|---|
| Strength | 3–5 × 3–5 | Heavy (~85%+) | 2–3 min |
| Hypertrophy | 3–4 × 8–12 | Moderate (~65–75%) | 60–90 s |
| Endurance | 2–3 × 15–20 | Lighter (~50–60%) | 30–45 s |
Pick the row that matches your goal. If you're newer, anchor in the hypertrophy range while you groove the form.
Form tips
- Keep the knees tracking in line with the toes and push the whole foot into the floor.
- Set the seat and pads so the machine's pivot lines up with the joint you're training before your first rep.
- Treat every rep the same — a repeatable setup and bar path is what lets you add weight safely over time.
- Breathe out on the effort and in on the return, keeping one steady rhythm across the set.
Common mistakes
- Letting the knees cave inward as you push out of the bottom.
- Leaving the seat or range on a setting that forces the joint into an awkward angle.
- Chasing weight jumps before the current load feels solid on every rep.
Frequently asked questions
What muscles does Single-Leg Leg Extension work?
Single-Leg Leg Extension is a focused movement that primarily works the quads.
What equipment do I need for Single-Leg Leg Extension?
Single-Leg Leg Extension needs the corresponding weight-stack or plate-loaded machine.
How many sets and reps should I do for Single-Leg Leg Extension?
It depends on your goal: about 3–5 sets of 3–5 heavy reps for strength, 3–4 sets of 8–12 for muscle growth, or 2–3 sets of 15–20 for endurance. Pick the row that matches your goal. If you're newer, anchor in the hypertrophy range while you groove the form.
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