Try this variation of a plank

This variation of a plank is one of my favourite exercises. Up Down Planks on a Bosu Ball are great for working not only your core but also your chest, back, and shoulders. Incorporate these into your routine for 1 min rounds.

With the Bosu Ball Blue side up, perform a plank by placing your forearms on top of the Bosu. Make sure to keep your hips in line, then lift up onto the right hand, then the left-hand. Do one arm starting with the lift up for 30 seconds then switch to the other side for another 30 seconds.