Physical fitness in kids refers to their ability to perform physical activity. Their fitness level is not only important for success in sports and athletics, but also for good health. Aerobic fitness ...

"Aren't they a little young for that?" This is a question I used to hear regularly from parents when I'd recommend strength training for the kids I worked with, whose ages ranged from 6 to 18 years ...

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. For years, my kids ...

Zachary Gillen does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...