Doing a classic plank using a BOSU works your entire body, especially your core and arms, even more by challenging your balance.
- Start facing the floor, resting on your knees.
- Turn the BOSU over and position it at the top of your mat so the handles are on the side. Plant your palms on each side of the BOSU, shoulder-width apart. Your palms should be flat; spread your fingers out wide to help support your weight and take the strain out of your wrists. Step your legs out behind you one at a time, and rest on your toes.
- Contract your abs to prevent your butt from sticking up or belly from sinking. Your spine should be straight, not, with your abs pulling toward the ceiling.