Set-up: Put a calf-raise box or other firm, flat elevated object next to a support. Set up with your heel 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.
Repetitions: Perform all prescribed reps on one side, then on the other. This counts as one set.
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.