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Exercise library / Leg Extensions

Leg Extensions

Suggestions, not prescriptions. Exercises here pass automated checks. They have not been clinically reviewed, and no exercise is right for everyone. Adjust to your comfort and ability.

A seated machine exercise that straightens your knee against a pad. It trains the front of your thigh.

Main focus
Strength
Level
Starting
Equipment
Gym machines
Load
A guided machine path
Stability
Guided by a machine
Before you start
  • Warm up first with a minute or two of easy walking or marching in place, and cool down the same way after.
  • Wear flat, closed shoes with a good grip, or go barefoot on a non-slip floor if that feels steady to you.
  • Clear the floor around you. Keep a sturdy chair, counter or wall within reach for any move you do standing.
  • Build up slowly. Add repetitions or minutes over weeks, not days. If you take a break, work back up gradually.

Talk with a doctor or physical therapist before you start if you have not been active for some time, if you have a health condition or a worry about exercise, if you have fallen or fear falling, or if a clinician has told you to limit activity. This library is general information, not medical advice.

What you need

A gym machine, with a trained person to show you the set-up the first time.

How to do it

  1. Sit with your back against the pad and the roller resting on the front of your lower shins, just above your feet.
  2. Straighten your legs until they are almost straight, without snapping the knee back.
  3. Pause for a second at the top.
  4. Lower slowly until your knees are bent about a right angle.

How much

To start: 1 to 2 sets of 8 to 12 slow repetitions, resting 1 to 2 minutes between sets.

As it gets easier: 2 to 3 sets of 6 to 12 repetitions with good form, resting 1 to 3 minutes. Add load or repetitions gradually, no more than about once a week.

How it should feel: The muscles you are working should feel the effort. The last repetitions should be hard but controlled, never shaky or painful.

Make it easier

  • Use a lighter weight and a shorter range.

Make it harder

  • Pause for two seconds at the top.
  • Slow the lowering to three seconds.

Safety

  • Warm up first, and keep your breathing steady. Breathe out on the effort and in as you ease off. Do not hold your breath.
  • Move with control. Do not lock your joints straight at the end of a movement.
  • Choose a version, load and number of repetitions you can finish with good form. The last few should feel hard but not shaky.
  • Adjust the seat, pads and range so the machine fits your body before you add weight.
More safety notes
  • Start with a light weight and learn the movement.
  • Use the full, controlled range that feels comfortable. Do not let the weight stack drop or bounce.
  • Set the machine so the roller does not press on your ankle.

When to stop

  • Stop and rest if you feel dizzy or lightheaded, sick to your stomach, or unusually short of breath.
  • Stop if you feel sharp, sudden or joint pain. Muscles working hard is expected. Pain is a signal to stop.
  • Stop and sit down if you feel unsteady and cannot settle yourself right away.
  • Call your local emergency number for chest pain or pressure, fainting, or sudden weakness, numbness or trouble speaking.
  • After any of these, do not repeat the exercise until you have talked with a doctor or physical therapist.
  • A pad or handle does not fit and cannot be adjusted.
  • You cannot control the weight through the whole movement.
  • You feel pain in or around the knee.

Other ways to do this movement

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Where this comes from

General guidance on build-up, warm-up, breathing and listening to your body is from the NIA and the CDC. The steps were written by Fitafter50; the equipment and safety notes are Fitafter50's general practice and are approved as a set by the reviewer.

This is general information, not medical advice. It does not diagnose anything or tell you whether an exercise is right for you. Adjust to your comfort and ability.