Tag Archives: jennifer widerstorm

How To Do A Straddle Crunch + Midline Crunch with Jennifer Widerstrom

In this video, Jennifer Widerstrom, trainer on The Biggest Loser, shows you how to do two amazing core-building exercises. The first move, the straddle crunch, works your upper abs, and the second, the midline crunch, builds your lower abs and strengthens your pelvic floor.