Changing the angle of the feet by rotating the legs outward challenges different muscles of the lower leg than working in parallel. This position will work your arch of your foot more, too, and a strong arch helps prevent the ankle from rolling inward.
- Position your feet hip-distance apart, then externally rotate your thighs to turn your toes outward at about a 45-degree angle.
- Slowly raise your heels until you're on your tiptoes, then lower back down to the ground. Take three slow counts to raise and lower your heels.
- Do 20 reps.