Don't be intimidated by the box jump! It may look scary, but once you try it, you'll feel so badass that you'll start to love them! It's a great exercise to tone your legs, butt, and core, and because ...

Rosa Duarte from CrossFit Advanced in Easton, Pennsylvania, teaches you the proper way to perform the box jump, which will help give you an explosive boost to your running. We may earn commission from ...

Add Yahoo as a preferred source to see more of our stories on Google. Most gyms have plyometric boxes. They're also found in parks with public workout areas. Photo: Getty Images Building body strength ...