Add Yahoo as a preferred source to see more of our stories on Google. "Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." YOU MIGHT THINK back to your ...

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 ...

Things high school gym class was good for: gossiping, checking out your wanna-be S.O. in track shorts, and kinda-sorta learning basic exercises. Jumping jacks were one such staple of P.E., and for ...

Real talk: The thought of doing jumping jacks may be only slightly more enticing than burpees. It may bring back memories of pre-dodgeball warm-ups back when dodgeball was part of gym class. Yet, ...

From your elementary school gym class to your current high-intensity interval training, it seems like no cardio routine is complete without at least one rigorous round of jumping jacks. But there's a ...