It may be a childhood pastime, but it’s also an effective workout ... the rope around jump your feet open hips-distance apart ...

Jennifer Garner showed off her impressive box jump workout in a video posted to her Instagram Stories on Sunday, April 13.

Hop. Step. Jump. Hop. Step. Jump. No, that's not the latest dance craze, it's how track stars do the odd-looking but athletically impressive triple jump. It's a difficult discipline to master ...