A leg extension is a strength training exercise primarily targeting the quadriceps muscles in the front of your thigh. The movement involves bending at the knee and extending your legs out in front of you, typically using a lever machine at the gym or home with a padded bar for support.

Leg extensions primarily target the quadriceps muscles, which are used for daily activities, such as climbing stairs or getting up from a seated position. These muscles are located in the front of your thighs and consist of the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius.