How does a 97-pound weakling become the World's Most Perfectly Developed Man, as Charles Atlas did? Through the sport known as bodybuilding. Here are 10 of the greatest, most well-known bodybuilders to grace the stage.
Bones and muscles -- the musculoskeletal system -- are what make the body move. Learn how every movement of the body is the result of the coordination of bones, muscles, tendons, and ligaments.
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