Whitney Carmichael has always been the odd one out in her family of athletes. And when her best friend bops her with a tennis ball, it's the last straw. She's going to tackle her fears about working out -- and she does it by attending a five-week summer boot camp. From the first mile-long run to the dreaded rope hang, Whitney isn't sure she'll survive. And toss in the fact that Willow, someone who made her life miserable on an almost daily basis while they were at school, shows up -- Whitney isn't sure how she'll succeed.