Water Exercise: Power in Resistance (cont.)

But after about an hour, my legs were tired, my heart was racing, and my back didn't hurt. So I kept at it. When my back finally got better, and I laced up my sneakers again, my heart and muscles felt strong, and I hadn't lost a step.

Changing the Way People See Water Exercise

Before I started this routine, I thought of aqua exercise as something that might be fine for my grandmother, but way too wimpy for me. "That's wrong," says Mary E. Sanders, MS, professor of health ecology at the University of Nevada, Reno, and creator of many aquatics programs. "While water exercise can be great for older and overweight people, it's equally good for serious -- even competitive -- athletes." What's more, if you're pressed for time, water exercise is a great way to squeeze an intense workout into a short period.

Sanders should know. Besides looking the part of someone who's discovered a terrific workout, she's done numerous studies comparing water exercise to its land-based counterparts. Time and again she's found that the wet workouts are as good or better than dry ones in terms of fat and calorie burning, cardiovascular efficiency, and endurance.

In one of her studies, walkers who water-trained for four months increased their on-land walking speeds by more than 16% and their stride lengths by 10%. And check out these numbers: a 130-pound person burns about 6 calories per minute by aerobic dancing. The same person running in deep water at an 11-minute-per-mile pace burns about 11 calories per minute.

And more and more people are diving in. Besides ordinary folks like me, world-class athletes such as Carl Lewis are into water exercise. Their pool workouts give their bodies a break between grueling land sessions, while helping to increase speed and sharpen form. "Active recovery," they call it. College runners and basketball and volleyball players also can routinely be found training in water.

The Unbearable Lightness of Water

So what makes water so great? Several things. First, its natural viscosity, or thickness, challenges your body with a constant state of resistance. To generate greater resistance you have several options: for instance, if you wear gloves or hold your fingers closed, you'll find it harder to move your hands through the water. Pushing yourself to go faster creates more resistance. Current and depth can also make your workout harder. Ever try to swim in choppy ocean waters? The deeper you go, the tougher the work.

For the injury-prone, injury-wary, or already-injured person, water is an extremely forgiving environment. During a run on land, your foot strikes the ground between 800 and 2,000 times per mile, each time at a force of up to four times your body weight, says David Brennan, aqua running expert and assistant clinical professor of physical medicine and rehabilitation at Baylor College of Medicine in Houston. Your knees, ankles, and back take the brunt of this pounding, but in water your joints and skeleton are cushioned. You can work as hard and as fast as you want, but without the impact-related problems.

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