Step by step instructions
Place the bosu ball soft side up and stand in the center, shifting your weight onto one leg. Keeping eyes up and shoulders relaxed, brace lower abs in tight (as if you were trying to hold in urine).
Extend left leg laterally and hold it there as you bend your right leg and lower yourself slowly (count to 5) into a squat. Ascend explosively to complete one rep. Repeat, trying to keep the lifted leg up throughout the entire movement.