Whenever I get the itch to work out, I often stand around and wonder where to start. Do I feel like running? Going to the gym? Doing yoga? And even then, what kind of yoga? It’s why I was intrigued by ...

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. Cardio is good for us, ...