Leg Extension
The Leg Extension primarily works the Rectus Femoris, Vastus Lateralis, Vastus Medialis, with secondary activation of the Vastus Intermedius and stabilizer support from the Rectus Abdominis. It is a machine isolation exercise at beginner difficulty.
Machine leg extension extending knees emphasizing quadriceps.
| Equipment | Machine |
|---|---|
| Difficulty | Beginner |
| Type | Isolation |
| Movement | Extension |
| Force | Push |
| Laterality | Bilateral |
| Primary | Rectus Femoris, Vastus Lateralis, Vastus Medialis |
| Secondary | Vastus Intermedius |
Muscles Worked
Front
Back
Primary
Secondary
Stabilizer
Primary Muscles
- Primary Muscle Rectus Femoris (quadriceps)
- Primary Muscle Vastus Lateralis (quadriceps)
- Primary Muscle Vastus Medialis (quadriceps)
Secondary Muscles
- Secondary Muscle Vastus Intermedius (quadriceps)
Stabilizer Muscles
- Stabilizer Muscle Rectus Abdominis (core)
Instructions
- Preparation: Adjust machine seat and pads to fit body. Sit or position body in machine. Execution: Extend through full range of motion against resistance. Return to starting position under control. Repeat. Comments: Maintain control throughout movement to fully engage the Rectus Femoris, Vastus Lateralis, Vastus Medialis.
Alternative Exercises
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