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Find out the what, when, why, how, and where of cross-training, and: which muscles are worked by which sports; how to combine your favorite activities into an all-around workout; cross-training to enhance performance in a single sport or event; using cross-training to help avoid injury; working less common activities--like waterskiing, in-line skating, jazz dancing, and boxing--into your cross-training program; and much, much more.