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Last updated February 2, 2026
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adductorscalveshamstringsquadriceps

Leg Extension (Machine)

Adjust the pad to rest on your lower shins. Kick your legs up until straight, squeezing your thigh muscles (quads). Lower firmly but with control; don't just drop the weight.

Quick facts

Difficulty
Easy
Mechanic
Isolation
Force
Push
Type
Strength
Injury Risk
Low
Hypertrophy
High
Calorie Burn
Low-Medium

Muscle focus

Primary and secondary muscle groups targeted by this movement.

Primary

quads

Secondary

front quad

Equipment & setup

What you need and how to position yourself before starting.

Equipment

weight machines / selectorized

Movement pattern

Bilateral

Posture

Seated

Tracking parameters

repsweight

Step-by-step instructions

Follow these cues to master proper technique and stay safe through every rep.

  1. Step 1Setup
    • Adjust the seat of the leg extension machine so that your knees align with the pivot point of the machine.
    • Sit down and ensure your back is against the backrest, with your feet positioned under the padded bar.
  2. Step 2Adjust the Machine
    • Set the weight on the machine according to your fitness level.
    • Make sure the padded bar is resting comfortably on your lower legs, just above your ankles.
  3. Step 3Position Your Feet
    • Place your feet shoulder-width apart and flex your feet slightly to engage your quadriceps.
    • Ensure your knees are in line with the machine's pivot point.
  4. Step 4Extend Your Legs
    • Slowly extend your legs upward by straightening your knees, keeping your feet flexed.
    • Focus on contracting your quadriceps as you lift the weight.
  5. Step 5Hold the Position
    • Pause briefly at the top of the movement when your legs are fully extended.
    • Avoid locking your knees to prevent injury.
  6. Step 6Lower Your Legs
    • Gradually lower the weight back to the starting position by bending your knees.
    • Maintain control of the movement and avoid letting the weight drop quickly.
  7. Step 7Repeat
    • Continue to repeat the extension and lowering for the desired number of repetitions.
    • Focus on maintaining proper form throughout each rep.
  8. Step 8Finish the Exercise
    • After completing your reps, carefully lower the weight and remove your feet from the padded bar.
    • Stand up slowly and ensure you feel stable before leaving the machine.
Version 1 · Created November 12, 2025