Katy Perry looks amazing in her various bikinis. What's her secret? According to a recent interview with Cosmo, her favorite way to exercise is jumping rope. Not only does it burn calories — 295 per 30 minutes — but jumping rope also helps build bone-mineral density and makes your body stronger.
It's a simple and inexpensive way to get your heart rate up; use it as your main form of cardio or to warm up before strength training. Katy even jumps rope as a warmup before shows. Since this little gadget is so portable, you can pack it in your gym bag, suitcase, car, and even your purse and always have a way to get in a good workout.