The single-leg donkey calf raise develops size and strength in the lower leg.
Stand on a weight plate on the ground with your heels hanging off the edge. Cross one leg behind the other resting your shin on the supporting leg's calf and lower your supporting heel toward the floor.
With your toes firmly on the plate, drive your heel toward the ceiling. Pause, then contract your calf muscle. Slowly lower your heel back to starting position.
Make sure to drop the heel as far as possible to achieve the greatest stretch.
Keep your leg straight throughout the movement and don't bend and extend your knee to force the movement.
Be sure to squeeze the calf at the peak extension of the movement.