Hey Lexi it's one of those vibrating machines. I haven't used one before but here is a bit about it from their site.
VibroGym works by rapidly vibrating up and down to create extra g-forces on the body. The vibrations also create a reflex contraction of the muscles that produces higher levels of muscle activation than can be achieved in normal exercise.
Because the vibrations travel through the whole body stability muscles, such as the abdominals and pelvic floor, can be stimulated while performing other exercises, thus helping to tighten the tummy while you sit or stand on the plate.
Let me know if you try it
SW: 108.3 (4Feb08)