For the advanced BOSU baller, place the ball side down on the ground with the flat platform facing up. Carefully step onto the platform with one leg, letting the BOSU sink to the floor for more stability. Then carefully step on with the other leg. If you need to use a hand on the ground (or a partner) for stability, that’s fine. When you stand up, you’ll immediately feel the instability. If you are comfortable, slowly hinge from you hips and send your butt back into a squat.