It started as one of those days where nothing seemed to stay put. I was halfway through my workout when my Stability Ball (also known as a Swiss Ball or Fitness Ball ) suddenly rolled away mid-exercise—straight into my BOSU®. They collided with such perfect timing that I actually stopped, laughed, and thought, hmm… maybe this is a sign to try something new. So, I experimented. One hand on the BOSU®, the other on the Ball. Instantly, my entire core lit up. My muscles fired, my