Position yourself for this exercise by adjusting a lying leg curl machine so that it appropriately fits your height. Lie face down on the machine so that the machine lever pad is positioned on the back of your legs (it should be about 2 or 3 inches under your calves). Ensuring that your torso is positioned flat on the machine, your legs are fully stretched, and your toes are pointed straight (facing downwards), firmly grasp the handles on the side of the machine. To execute the exercise, curl your legs up as far as you can without allowing your upper legs to leave the surface of the machine. Once you have curled the lever back as far as you can in this manner, hold the peak contraction briefly before returning to the starting position. Repeat for the prescribed number of repetitions.