The Bouncy Belly-Ball Squeeze

Mechanism · Protocol Notes

Folks, prepare to meet the most unstable, most ridiculous-looking, and yet most brutally effective core move you'll ever perform on a giant inflatable sphere. This ain't your office chair — though it probably should be — this is the exercise ball crunch, and it will humble you faster than you can say "I thought this was easy."

Drape yourself over one of those oversized rubber balls so your lower back is cradled by its curved surface. Your feet stay anchored flat on the floor, knees bent, while your upper body arcs backward over the dome like a human bridge. Position your arms either across your chest or sliding alongside your legs — just don't clasp them behind your head, or your neck will send you a very angry email tomorrow.

From this dramatic backbend starting point, curl your torso upward by squeezing your midsection with everything you've got. Your shoulders and trunk lift while your hips remain locked in place, and your lower back never loses contact with the ball. Hold the peak contraction for a heartbeat, then slowly recline back to the stretch. The ball's inherent instability forces your core to work overtime just keeping you from rolling off like a rogue bowling ball, which means every single rep is twice as effective as a floor-based alternative. You're welcome.