Place Bosu on floor (dome side up) and stand with left foot atop center of Bosu and right foot on floor to right of Bosu. Lower into a squat to start.
Press into floor and Bosu with feet to jump up.
Switch feet in midair so that right foot lands atop center of Bosu and left foot lands on floor to left of Bosu. Continue alternating.
Scale down: Omit jump and stay low in squat position as you switch leg position, quickly tapping feet to floor as you alternate.