Swimming is great for weight loss: A 30-year-old 130-lb. woman with an active lifestyle can burn from 225 to 340 calories in 30 minutes, depending on intensity.

According to Alison Wandzura of Swimco, polyester swimsuits resist chlorine and salt water well. And they’re getting better-looking all the time. For those who don’t want to give up their fashionable Lycra or spandex blends, several new styles are specifically made to hold up longer in chlorinated water.

Tip: To extend the life of your bathing suit, shower with it on to rinse out chemicals. You can also get special swimwear cleaners that strip out chemicals.