Swimming has been called the “perfect exercise.” It gives you an outstanding cardiovascular workout. Because the water supports your weight, it does so without stressing your joints. If you have arthritis, if you are overweight, or if you have an overuse injury from walking, jogging or running, swimming may be just the exercise you’re looking for. As an added benefit, swimming works your upper and lower body at the same time. Serious marathon runners have muscular legs but spindly arms. Competitive swimmers, on the other hand, have a beautifully symmetrical, balanced physique.

Of course, swimming is not quite as easy or convenient as walking. You can’t do it anywhere; you need a pool. But for the benefits it provides, it’s well worth finding one. Most communities have a pool—check with your local department of parks and recreation. There are also pools available at many colleges, most YMCAs and many large commercial gyms. If you’re traveling...

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