Improve your flexibility by taking a yoga class. If you're a beginner, try a class in hatha yoga, which concentrates on breathing, balancing strength and flexibility. If you're an old pro, try taking a different style like bikram yoga in which you cycle through 26 poses in a room heated to about 105 degrees. Ashtanga, kundalini, iyengar and vinyasa yoga also offer a variety of challenges and rewards.