Wendell Petersen, 61, stopped running long distances after he suffered a herniated disk. Marti Devore, 53, abandoned stair climbers and treadmills when she aggravated an old hip injury. Marilyn Franzen, 52, gave up racquetball and triathlons after three knee operations. As Petersen, Devore, Franzen and any other middle-aged fitness buff can tell you, the older you get, the more you have to deal with creaky and painful joints. But the benefits of exercise--from lower blood pressure to improved mood--are just too great to pass up. So most people who want to remain active eventually learn to accommodate their aging bodies by...
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