To strengthen your shins, ankle, and lower leg:
Toe raises: Stand on a stair facing upstairs with your heels hanging over the edge. Dip the heels down, then raise them high. Repeat 10-20 times.
Foot fun: While sitting around, several times a day, tap your toes quickly for several seconds. Then write the alphabet in the air with your foot. Repeat with the other foot.
Heel walking: As part of your warm-up, walk on your heels for 30 seconds.