The Buoy is designed to be off-balance, like its namesake bobbing device, though not as extremely as a Pilates ball; the idea is that the microadjustments you're continually making with your body are not annoying enough to be a hassle, but adequate to burn some calories. Also unlike a Pilates ball, the Buoy is height-adjustable.
Flexible Seating made easy in the classroom. This post is filled with the most FAQ's and answers. It also comes with links to where she gets all of her flexible seating options! A must read for any teacher that is thinking about doing flexible seating in their classroom!