<a class="link" rel="nofollow" target="_blank" href="http://www.popsugar.com/fitness/Pool-Workout-Abs-Core-31029282"></a><p>Beat the heat and tone your middle in the pool. Here are five exercises that tighten your abs while working your core - all to be done in the water. Watch this video to learn the moves, then dive right into the workout! </p>