Set-up: Put a calf-raise box or other firm, flat elevated object next to a support. Set up with your heels on the box and your toes off it.
Lift: Lift your toes up toward your shins, then let the toes move down past your heels.
Optional weighting: Once the exercise is no longer challenging with just bodyweight, you may also weight the exercise with vests or chains, or by carrying a dumbbell in one hand.