Muscles Trained: Quadriceps (quads), hips

Intro: Leg extensions are a decent exercise that can be used to supplement an already established leg routine. Compound quad exercises such as squats and leg press are superior to the leg extension for muscle building purposes. This is not to say that leg extensions are not effective when used along side them. Some people even use them as a warm up lift before performing the bigger leg exercises.

How it is performed: Approach the leg extension machine and adjust it accordingly. Sit down and grab the support handles while you place your legs in the starting position. Move the weight upward by extending your legs fully and getting a nice stretch in your quads. Your legs should be straight at the peak of the lift. In a controlled manner, lower the weight back to the starting position.

It is recommended to do a few light repetitions first as some leg extension machines differ. If you adjusted the machine, a warm up set will tell you if you need to make any further adjustments. Using too heavy a weight can cause a potential injury if your glutes come off of the seat. Lower back injuries are very common with leg extensions, so it is essential that correct form is followed.