Until a few years ago, I was thin but unfit. Literally clueless about what to do in a gym. Then metabolism hit me in the face (actually, my waistline), and I had to learn the ins and outs of fitness ...

Celebrity fitness power couple Chris and Heidi Powell show us some basic boot camp moves to do at home in Yahoo Life’s fitness series, “Take 5.” This five-minute workout routine is designed for ...

Core strength goes deeper than aesthetics — it’s essential for preventing back pain and injury and improving sports performance. This beginner ab workout will get you started. Nearly every movement ...

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. While plenty of ...