Sitting on the edge of a chair, extend your legs out in front of you, keeping your knees slightly bent and placing your heels on the floor, toes pointed upward. Point the toes downward, then flex them upward. Do 10 to 15 sets of point and flex. Rest. Do another set of 10 to 15 repetitions.
Modification: Sitting in the same position as above, flex the toes and place the ball on top of your shoelaces. Try to hold the ball with flexed toes in that position for about 10 seconds, or as long as you can. Repeat 1 to 2 times, resting for a few seconds between each exertion.