Leg Extension

A seated machine isolation extending the knee against a pad, targeting the quadriceps directly. Used to add quad volume with no balance or lower-back demand.

DIFFICULTY
Beginner
EQUIPMENT
Machine
PRIMARY MUSCLES
Quads
ALSO WORKS
Rectus Femoris · Vastus Medialis (VMO)
Leg Extension
HOW TO DO IT
  1. 01Sit in the machine with the back against the pad and the knees at the pivot.
  2. 02Set the ankle pad just above the top of the feet.
  3. 03Hold the handles and brace the trunk.
  4. 04Extend the knees until the legs are straight, squeezing the quads.
  5. 05Lower under control without letting the weight crash down.
COACHING CUES
  1. 01Line the knee joint up with the machine pivot.
  2. 02Squeeze the quads at full extension.
  3. 03Control the lowering — no dropping.
COMMON MISTAKES
  1. 01Swinging and using momentum — keep it strict and controlled.
  2. 02Slamming the stack at the bottom — resist the negative.
  3. 03Setting the knee off the pivot — it strains the joint and cuts the quad work.

Note: Reference material, not a prescription. Load, volume and whether this movement suits you at all depends on your assessment — if something hurts, stop and get it looked at.

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