"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." READY TO GET some air? If you haven't incorporated plyometric jumps into your routine yet, you're missing ...

Plyometrics utilize the speed and force of quick, challenging movements to build muscle power. It comes as no surprise that plyometric boxes are a favorite piece of exercise equipment for ...

Jennifer Garner is back on Instagram with another workout video that'll have you out of breath just watching. To be fair, this time Garner didn't post it; her trainer, Beth Nicely, did in honor of ...

Many ambitious runners know the feeling: Despite regular running training, endurance or speed improves only slowly or even ...