Proper shoes are crucial to successful, injury-free aerobics. Shoes should provide sufficient cushioning and shock absorption to compensate for pressure on the foot many times greater than found in walking. They must also have good medial-lateral stability. Impact forces from aerobics can reach up to six times the force of gravity, which is transmitted to each of the 26 bones in the foot.
Because of the many side-to-side motions, aerobic shoes need an arch design that will compensate for these forces, and sufficiently thick upper leather or strap support to provide forefoot stability and prevent slippage of the foot and lateral shoe "breakup." Make sure shoes have a toe box that is high enough to prevent irritation of your toes and nails.
Many agree that the old sneakers in your closet are probably not the proper shoes for aerobics. Major shoe companies today have designed special shoes for aerobics, which provide the necessary arch and side support; they also have soles that allow for the twisting and turning of an aerobics regimen.
Running shoes, perhaps the most popular of all athletic shoes, lack the necessary lateral stability and lift the heel too high to be considered proper for aerobics. They also often have an acute outside flare that may put the athlete at greater risk of injury in sports, like aerobics, that require side-by-side motion.
Buy your aerobics shoes in the afternoon, when your feet swell slightly. Wear the same socks (podiatrists recommend athletic socks made of an acrylic blend) that you will wear in training.