Machine Leg Extension
This is a good basic exercise that develops the quadriceps.
STEP 1. Position your lower legs behind the shin pad, making sure that the pad is on the lower part of your shins rather than your ankles. Line your knee up with the pivot points on the machine and make sure that your starting position is comfortable.
STEP 2. Exhale and extend your legs at the knee – stop the movement just before your legs become straight.
STEP 3. Inhale and slowly return your legs to the starting position.