NEW YORK (Reuters Life!) - As the pros hit the courts for the start of the U.S. Open, tennis beginners and aces alike are burning calories and practicing their lobs, drop shots and backhands with ...

Cardio is more than just running laps or hopping on a bike. It's any movement that gets your heart pumping, your body sweating and your energy levels soaring. Whether you're chasing a weight loss goal ...