This Insane Ab Exercise Even Has Pro Athlete Lindsey Vonn Grunting

We're right there with you, Lindsey. This ab move looks insanely hard, and sometimes we need to be a little verbal about it. Sometimes we need to moan and grunt our way through the pain. Whatever gets you ready for ski season, right? (PS, we are loving that one-piece bodysuit!)

Olympic skier and general badass Lindsey Vonn is no stranger to intense strength-training moves. Heck, she even did "naked" pull-ups on the set of her Sports Illustrated Swimsuit shoot in a painted-on bikini. She works her core and upper body using a TRX and tones her booty in the pool with a resistance band. We appreciate the fitness inspiration and can't wait to try this move the next time we're at the gym!