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All workout and no play can make you miss a spot. "When you're being active just for fun, you call on so many muscles without even realizing it -- maybe some that your regular routine skips," says trainer Melissa Morin, the creator of the Adult Summer Camp class for New York Sports Clubs, which cribs total-body moves from favorite pastimes. When you can't get out for some old-school recess, grab a set of three- to five-pound weights for three circuits of Morin's quickie session. Then bring on the poolside selfies.