ProgreviaLeg extension
Home › Exercises › Quads › Leg extension
How to do it
Set the backrest and the pad over the instep. Extend the knee to near lockout, squeezing the quads at the top for a beat, and lower under control; avoid momentum and keep the glutes on the seat.
Muscles worked
Mainly cuadriceps. Train it inside a balanced routine to progress safely.
Technical sheet
- Movement pattern
- Isolation
- Minimum level
- Beginner
- Technical demand
- Basic
- Fatigue it generates
- Low (0.5 out of 2.2)
- Risk if technique breaks down
- Low
- Peak tension in the stretched position
These are the values the generator uses to decide where the exercise goes within the session.
Recommended sets and reps
As an isolation exercise, it works best in 3–4 sets of 10–15 reps with 0–2 RIR. Use it at the end of the session to add volume without systemic fatigue.
Common mistakes to avoid
- Letting the knees cave inward (valgus) when pushing, instead of keeping them tracking over the feet.
- Using too much weight at the cost of technique and full range of motion.
- Doing reps too fast, without controlling the eccentric (lowering) phase.
How Leg extension compares with other quads exercises
The catalogue has 16 exercises with quads as the main muscle group. Ranked from least to most fatiguing with the same values the generator uses, Leg extension is number 1.
That makes it a good candidate for adding quads sets at the end of a session or in heavy weeks, when you want volume without extra fatigue.
| Exercise | Equipment | Fatigue | Technique |
|---|---|---|---|
| Leg extension | machine | Low (0.5 out of 2.2) | Basic |
| Single-leg leg extension | machine | Low (0.6 out of 2.2) | Basic |
| Goblet squat | dumbbells | Moderate (0.8 out of 2.2) | Basic |
| Dumbbell step-up | dumbbells | Moderate (0.9 out of 2.2) | Basic |
| Static lunge | bodyweight | Moderate (0.9 out of 2.2) | Basic |
| Banded squat | resistance band | Moderate (1 out of 2.2) | Basic |
| Leg press | machine | High (1.2 out of 2.2) | Basic |
| Dumbbell lunges | dumbbells | High (1.2 out of 2.2) | Basic |
Tension with the muscle stretched. Leg extension loads the muscle when it is longest. In the review by Kassiano et al. (2023), across eleven studies, full range of motion and partials performed in the initial part of the movement — with the muscle long — produced more growth than partials performed at the end.
On a machine. In the meta-analysis by Haugen et al. (2023), with thirteen studies and 1,016 participants, there were no significant differences in muscle growth between training on machines and with free weights.
An isolation exercise. In the trial by Gentil et al. (2015), with untrained young men over ten weeks, the biceps curl and the lat pulldown were equally effective for gaining strength and size in the elbow flexors: isolation is not filler.
- Kassiano W, Costa B, Nunes JP, Ribeiro AS, Schoenfeld BJ, Cyrino ES. Which ROMs lead to Rome? A systematic review of the effects of range of motion on muscle hypertrophy. Journal of Strength and Conditioning Research. 2023;37(5):1135-1144.
- Haugen ME, Vårvik FT, Larsen S, Haugen AS, van den Tillaar R, Bjørnsen T. Effect of free-weight vs. machine-based strength training on maximal strength, hypertrophy and jump performance: a systematic review and meta-analysis. BMC Sports Science, Medicine and Rehabilitation. 2023;15(1):103.
- Gentil P, Soares S, Bottaro M. Single vs. multi-joint resistance exercises: effects on muscle strength and hypertrophy. Asian Journal of Sports Medicine. 2015;6(2):e24057.
Alternative exercises
More Isolation exercises
- Single-leg leg extension
- Overhead cable triceps extension
- Triceps pushdown
- Seated overhead dumbbell triceps extension
- Overhead dumbbell extension
Add it to your routine
Progrevia can generate a personalized routine that includes Leg extension based on your level, goal and available days.
Build your Quads workout
Generate a full routine with the emphasis on Quads and Leg extension among your preferred exercises. Free, no sign-up.
Not sure what to pick? The setup assistant walks you through it, one question at a time. Open the assistant
Frequently asked questions
What muscles does Leg extension work?
Leg extension mainly works the cuadriceps muscle group, plus synergist and stabilizer muscles depending on the variation.
How many sets of Leg extension should I do?
Between 3 and 5 sets per session, adjusting the total weekly volume for cuadriceps to your level (about 10–20 sets per muscle per week).
Is Leg extension good for building muscle?
Yes. Combined with progressive overload, good technique and enough rest, it's an effective tool to grow cuadriceps.
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