Sometimes, you get to the gym in high spirits, ready to sweat it out. But other days, you might be pressed for time, squeezing in a workout between brunch and dinner plans. Or maybe you start to feel ...

Let me introduce you to your good friend, sweat. Ignore the gross feel and the potential for B.O. for the moment, and think about what it does for you: When your body gets too hot, threatening to ...

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. Let me introduce you ...