The BOSU adds an element of instability, which is always increase the difficulty of an exercise, and moving laterally over the BOSU works the shoulders nicely.
- Place a BOSU on the floor, flat side down. Come into plank position with both hands on top of the BOSU.
- Step the left hand onto the floor and lower into a push-up. As you straighten your arms arms, bring your left hand back onto the BOSU.
- Repeat on the other side placing the right hand onto the floor as you lower into a push-up; return the right hand onto BOSU while straightening your arms.
- This counts as one rep. Complete two sets of 10.
Source: POPSUGAR Studios