Forget jogging and spinning. It’s time to suit up for the best full-body workout: Swimming! This is the one exercise that does basically everything, from cardio to strength training to breath work, not to mention it’s another excuse to go shopping for a cute bikini. And trust us, you don’t need to be an Olympic gold medalist to take the plunge…but we figured it might help to have some guidance from one. We asked Olympian Jessica Hardy and NCAA champion Katie Kastes to tell us why their favorite sport is superior to everything else—and how to get our feet wet.