Leg Extension: Muscles Worked & Technique

Leg Extension exercise technique

Muscles Worked in Leg Extensions

Muscles worked in leg extensions

Primary muscles worked:

How to Do Leg Extensions

  1. Adjust the machine so that you are correctly positioned. Your knees should be in line with the machine’s joint.
  2. Extend your knees with control, until they are completely straight.
  3. Slowly lower the weight again.


The leg extension is an isolation exercise where it is easy to focus on the quadriceps.

Be careful when adjusting the machine, so that it suits your body. Besides getting your knees in line with the machine’s joint, try to get the longest comfortable range of motion.

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Text and graphics from the StrengthLog app.