Toe Raise

How to Do It: Stand barefoot, lightly holding on to the back of a chair. With your shoulders back and down and your abdominals pulled in, slowly lift your heels so that your body weight is on the balls of your feet, pause at the top, then slowly lower. Repeat 8 to 15 times.

What It Does: This challenges your core to hold you steady as you move vertically. Bonus: It also strengthens your calves.

Make It Harder: Try holding on with just the tips of your fingertips, then try it without holding on at all. Mastered that? Close your eyes and repeat the exercise.