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Why fry in scorching summer temps when the fastest way to rock a cute suit is to tone below the water's surface? "The key is that water offers heavy resistance," says Igor Porciuncula, the cofounder of Boot Camp H20 in Los Angeles -- 12 times the resistance of air to be exact. That means your moves engage more muscle fibers and burn more calories in a shorter amount of time. Snag a kickboard from poolside -- we used a Bettertimes Hydro model ($10, swimtowin.com) -- and do Porciuncula's shape-and-shred circuit twice through for sexy arms, tight abs, trim thighs, and zero dripping sweat.