Plus, the surprising benefits of turning the intensity down a notch.

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 ...

Achieving fitness success starts with setting clear and realistic personal goals. Whether you aim to improve overall health, build muscle, lose weight, or increase endurance, defining these goals ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. So where should you ...