About this exercise
A seated machine isolation exercise extending one knee at a time against the resistance. Working one leg per repetition gives the quadriceps a direct, controlled stimulus and helps even out strength differences between the legs.
Machine Leg Extension
Step by step instructions, muscle activation and variants for the Machine Leg Extension.
EasyQuadriceps
How to Perform
- Sit on the machine with your back against the pad and one shin behind the padded lever, the other foot resting on the floor
- Grip the handles for stability
- Extend the working knee until the leg is fully straightened, squeezing the quadriceps
- Lower the lever back under control
- Complete the repetitions, then switch legs
Muscle Activation
Primary
Quadriceps
Common Mistakes
Common mistakes content is coming soon.
About the Machine Leg Extension
The Machine Leg Extension is a foundational movement that builds strength and muscle through controlled, progressive overload. Train it 1 to 2 times per week with 3 to 5 working sets per session, gradually adding weight or reps as form holds up.
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