1. Home
  2. Exercises
  3. Leg extension
Quads

Leg extension: how to do it right

On the leg extension machine you straighten your legs seated against a roller. It isolates your quads.

Main muscle
Quads
Equipment
Leg extension machine
Level
Beginner
Leg extension: start position
Start position
Leg extension: end position
End position

Step by step

  1. Adjust the backrest so your knees line up with the machine's pivot.
  2. Place the roller over your ankles.
  3. Straighten your legs until they're almost straight.
  4. Lower slowly until your knees are at about 90°.

Tip: A one-second pause at the top greatly increases the work.

Common mistakes

Knees misaligned

If your knees aren't on the machine's pivot, the movement strains them.

Kicking

Lift with control, without momentum.

Lifting your hips

Hold the seat handles and keep your hips down.

Sets and reps

Guide ranges. Start with a weight where the last rep is hard but your technique holds.

GoalSetsRepsRest
Strength3–53–62–3 min
Build muscle3–46–121.5–2 min
Health and fitness2–310–151 min

In GymOrbita you log every set and the app suggests the weight for your next session based on what you did last time.

Alternatives

If the machine is busy or you want a variation:

FAQ

Is it bad for the knees?

With the right weight and your knee aligned with the machine it usually feels fine. If it hurts, lower the weight or the range.

General technique information, not a substitute for professional advice. If you have an injury or pain, check with a doctor or physiotherapist first.

Add leg extension to your routine

GymOrbita has this exercise with its animation: log the weight and reps of every set and track your progress. Free.