Exercise Advice: This exercise is done in a standing position with your feet about shoulder width apart. Grab a dumbbell in each hand and let each hang by your sides. Begin by pushing your toes down so that your heels become raised so that you are on your tippy toes. Be sure to really flex your calves at the top of this movement for a one-count. Return to the start position and repeat until failure. The initial upward movement should be quick and explosive.