Five 15-Minute Workouts
What it does: Strengthens the back, buttocks, arms, and legs; stretches the shoulders, chest, abs, and thighs.
How to do it: Lie facedown, arms at sides, feet pointed. Press your legs down, inhale, and lift your head, shoulders, and arms. Take two full breaths, then lower everything. With your forehead down, lift both legs and take two full breaths. Lower. Lift your upper and lower body at the same time and take two breaths.