Also known as “aqua aerobics” or “water aerobics”, these classes provide the same cardiovascular workout as a regular aerobics class — minus the strain on the body. The water cushions and massages the muscles while at the same time providing a low- or no-impact cardio workout. A typical 45 – 50 minute class includes stretching and strength exercises that use the natural resistance of water instead of weights or machines. Deep water classes tend to be more challenging than shallow, but your abdominal muscles will get a good workout. You can go at your own pace, and it won’t be obvious if you miss a step in the routine.