Charity may begin at home, but more and more, the charitable impulse winds up spilling over into our leisure time. Millions of Americans are walking to beat breast cancer, cycling to benefit people with MS or HIV, playing golf or beach volleyball to help find and fund a cure for Alzheimer's or some other nasty disease.

It's a good thing. Exercising your instinct to help others is one of the healthiest fitness trends of the last 10 years, right up there with workplace yoga classes and t ...

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