Find a step 4 inches off the ground. Stand with the back half of your foot hanging off the step. Lower your heels 2 inches. Press up so that you are standing on the balls of your feet. Repeat 15 to 20 times to complete one set. Do two sets to complete the exercise. Personal trainer James “Flex” Lewis recommends pointing toes in to isolate the inner calf and pointing toes out to isolate the outer calf.