HOW:Set-up a bosu in front of you within a comfortable distance that you can step onto without losing your balance. Perform a forward lunge onto the bosu and slowly lower yourself down into a lunge position, then return to standing position and repeat.
FEEL: This shoulder feel like a full lower leg workout as well as a core workout to maintain optimal positioning. Your glutes, quad, and calf should all be working together to maintain balance.
COMPENSATION: Do not rush this exercise, focus on balance and control. Do not lose your balance side to side.