Stand with one foot on the flat side of a BOSU balance trainer and the other foot on the ground behind you. Lower your back knee toward the BOSU into a lunge, then push through the front heel to rise up and drive your back knee upward into a high knee position. Keep your torso upright and core engaged throughout to maintain balance and control.
Log your high knee lunge on bosu ball sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.