Jumping jacks are one of the most underrated exercises in the fitness world. Simple yet incredibly effective, this childhood ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through the links below." YOU MIGHT THINK back to your childhood gym class and remember learning the basics of physical fitness ...

Jumping jacks are an efficient total-body workout that you can do almost anywhere. This exercise is part of what’s called plyometrics, or jump training. Plyometrics is a combination of aerobic ...