Exercise on BOSU, focusing on the obliques.
- Lay on your side on the BOSU, your upper leg outstretched and your lower leg bent comfortably. Use your lower arm to stabilize you on the BOSU and your upper arm should be straight along your side.
- Contract your oblique muscles to pull your upper body upwards, and reach your upper arm towards your knee. Repeat 10-15 times and switch sides.