Forget granny-style pool classes, this hourlong class uses resistance tools and cardio moves to tone your upper body and core while burning fat and improving flexibility—all without the high-impact pounding that comes with regular aerobics. “Pregnant women will feel considerably lighter in water so they can move around a lot better,” says Ellis Peters, aqua boot camp instructor at Equinox fitness in New York City.
Other pregnancy pluses: Water decreases stress on the joints and research shows that pregnant women who do water aerobics are less likely to ask for pain meds during delivery. To find a class, visit Equinox (equinox.com) or check your local gym.
Modifications: As your belly expands, widen your stance and your kicks.