Inverted hip extension with pushup: This move may look pretty, but it's for more than just show.

The pushup is great for sculpting your arms and chest muscles. Plus, keeping one leg in the air challenges your overall balance.

How to: Start in plank position with legs extended or knees down on floor. Extend your left leg diagonally toward ceiling, then bend your elbows by your sides, lowering your chest to the floor. Push back up and press back, lifting your hips into a three-legged dog. Do eight to 10 reps; switch sides and repeat.