We did the 100s on our knees, hip-width apart. On the BOSU we leaned back, at about a 45-degree angle, while inhaling, then pulled up on the exhale. We repeated the move for a total of 100 counts, long enough to make my upper thighs start shaking.
Garey ended the class by having everyone move to the floor for jumping squats and other cardio moves on the BOSU. Each of us, including Garey, fell off at some point, laughing.
The class would be a bear for beginners in Pilates or BOSU, and would leave most novices sore and sweaty. For people like me, who regularly train on the BOSU, it was fun to try new moves, even ones that didn't send my heart racing. The class flew by, and afterward, as Garey had warned, I felt my stomach muscles, every contour of them. I'll keep working on the moves at my own gym, where BOSUs are available in the stretching area.
After class, Eileen Gallagher, 48, a regular, said the BOSU had added a new twist to her usual Pilates workout. "You don't get bored. I think it's the most effective 50-minute workout for your abs, and particularly the obliques [on the side of the midsection], that you can do."