standing calf raise (on a staircase)

Stand on the edge of a step or a sturdy platform with your heels hanging off and your toes on the step. Hold onto a railing or wall for balance if needed. Slowly raise your heels as high as possible, lifting your body weight onto the balls of your feet. Pause for a moment at the top, then slowly lower your heels back down to the starting position. Repeat for the desired number of repetitions.