Strengthens the abs and core while also enhancing core stability.
- Start by laying on your back on the BOSU, feet planted firmly on the ground. Place your hands lightly behind your head, but be sure not to use your hands to pull your head forward.
- Raise one leg off the ground and try to touch your knee with your opposite elbow. Be sure to do this by using your abs and core and twisting your torso, rather than by pulling or twisting your neck.