In Exercise Ball: What's your ab workout?: Stretching and Cross Training: Runner's

The article is by Eric Cressey who has a Master’s Degree in Kinesiology, trains pro athletes and is the author of Maximum Strength. Okay, I can't resist; that program also included the following progression for side bridges: Week 1: 60 seconds per sideWeek 2: 75 seconds per sideWeek 3: 90 seconds per sideWeek 4: 105 seconds per side It was then that I realized that I'd been wrong all along in tr ...Exercise Ball