in college, i bought a stability ball to do crunches and to use instead of a desk chair. the ball wound up becoming more of a play thing when the guys would come over and one dude eventually popped it. i've yet to replace it, 8+ years later, but find myself using them at my gym.
if you have one at home or access to one at your local gym, give this workout a try. even i need a break from the machines and free weights and i welcome routines like this. you'll like it, i promise.
if you don't like it, you didn't do it correctly. ;)
eat clean. live lean. live better. live longer.