AS A PARENT, caregiver, or coach, seeing a kid get pumped about fitness and strength can feel kind of amazing. Especially when you consider that only between 21 to 28 percent of kids ages six to 17 ...

I’ve always been bookish. I spend most of my time in the lab rather than running, jumping or climbing. But I still have super strong muscles. They’re way bigger than when I was a young. I asked my ...