Add Yahoo as a preferred source to see more of our stories on Google. Jumping jacks, a staple of school gym classes, are not just for kids—they can also reveal much about your health. Even if you ...

Whether you’re a jumping jack fanatic or you haven’t done a jumping jack since middle school gym class, there’s one thing (okay, two things) most of us can agree on: jumping jacks are fun (they make ...

YOU MIGHT THINK back to your childhood gym class and remember learning the basics of physical fitness, setting a foundation for the grown-up workouts you continue to do today. While you likely keep ...