Machine Leg Extensions
Seated machine leg extension — direct quadriceps isolation through pure knee extension.
Level: Foundation
Primary: Quads
Movement: Isolation
Tags: Squat
Type: Strength (Weight Lifting)
Equipment: Machine
Sports: Football Running Soccer
Target muscles
The quadriceps drive knee extension. The fixed path puts all the work on the quads with no compensation possible. As an isolation exercise, the leg extension is among the most direct quad-builders available.
How to perform
Setup
Sit in the leg extension machine with the back against the pad and the ankle roller just above the feet. Trunk braced.
Execution
Extend the legs upward until they are nearly straight, squeezing the quads at the top. Slowly lower the weight back to the start. Don't slam the weight stack down.
Common mistakes
- Locking the knees fully and bouncing.
- Going too heavy.
- Cutting the range.
- Lifting the back off the pad.
- Using momentum.
Progressions and regressions
Regress to bodyweight leg extensions (sitting on a bench, lifting a leg). To progress, work pause reps, single-leg extensions.
Programming notes
Quad isolator. 3-4 sets of 10-15 reps, twice a week.
