Single-Leg Extension (Machine) primarily works the quadriceps and glutes. It is categorized as a squat movement and uses Machine.
- Primary muscles
- quadriceps and glutes
- Equipment
- Machine
- Movement pattern
- squat
- Catalog difficulty
- 3 of 5
How to do Single-Leg Extension (Machine)
- Adjust the seat or pad so the working joint lines up with the machine pivot
- Brace before descending and keep the whole foot planted
- Let the knees track in line with the toes
Common mistakes
- Letting heels lift or knees collapse inward
- Cutting depth shorter as the load gets heavier
Muscles worked
The primary catalog target is quadriceps, with glutes also involved. Exercise feel varies with setup, range of motion, and individual anatomy.
Easier and harder options
Easier option: Goblet Squat
Related exercises and substitutions
A useful substitute should preserve the job this movement has in the session—not merely train a nearby body part. Explore the related Movviva guides below, then compare pattern, target muscles, available equipment, and difficulty.
Goblet Squat · Goblet Squat · Leg Press · Barbell Back Squat · Box Squat (Bodyweight) · Heel-Elevated Squat
Put Single-Leg Extension (Machine) into a plan that adapts.
Movviva builds strength, mobility, and conditioning around your goal, schedule, equipment, and completed training—then gives you the next workout with guided targets and smart swaps.