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Marathoner Kara Goucher copped to hating cross training. But she also knows that, just like Internet security, you're only as strong as your weakest link. Fuel your athletic prowess and reduce your injury risk by attacking your least favorite exercise first. (Burpees, anyone?) "We tend to do what we are good at as athletes, avoiding certain exercises, body parts and movements," said Tom Holland, the author of "Beat the Gym." Need inspiration? Check out this killer interval workout soccer star Ali Riley, pictured above, loves to hate.

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