# Leg Extension (Single Leg)

> A one-leg machine knee extension that isolates your quads and exposes side-to-side differences.

Page: https://fitnessie.app/exercises/single-leg-extension/
Type: Machine · Isolation
Demo video: https://fitnessie.app/demos/leg-extension-single-leg/35b9f3325be651bf.mp4

## How to do it

1. Adjust the machine so your knees line up with its joint and your shins sit behind the pad.
2. Sit back against the pad and hold the handles.
3. Extend the working knee with control until the leg is straight.
4. Lower the weight slowly, finish your reps, then switch legs.

## Key cues

- Knees in line with the machine joint
- Sit back, hold the handles
- Longest comfortable range
- Other leg still and relaxed
- Lower slowly

## Common mistakes

- Knees out of line with the machine joint
- Letting the resting leg move
- Dropping the weight instead of lowering it slowly

## Muscles worked

- Primary: Quads

## Equipment

Leg extension machine.

## Variations

- [Leg Extension (Machine)](https://fitnessie.app/exercises/leg-extension/)

## References

- [StrengthLog: One-Legged Leg Extension](https://www.strengthlog.com/one-legged-leg-extension/)
- [BarBend: Leg Extension](https://barbend.com/leg-extension/)