In ballet it's called a releve, but in normal terms, just lifting yourself while standing from a flat footed position, to the tip of your toes, works out your calves. To get an even better calf workout, stand up on the ledge of a fireplace, or on a sturdy coffee table, and let the back of your feet dangle off the edge, so that your feet are at an angle, then tense your muscles to raise yourself up to the tips of your toes, then slowly go back down. Keeps your legs straight, as this intensifies the workout. This lady in the link below talks for awhile. Just skip halfway in to see what I'm talking about (if it doesn't make much sense).
