Maybe a stupid question. But what is part of the drill? Just the stance? Or also the leaning and turning movements you show in the video. I am confused.

Hey, I am enjoying your Youtube for a long time already. I recently bought a Bosu Board and now it‘s time for me to go premium. I have a question regarding the Bosu Ball. In this video the Ball seems to be not blown up fully. Is that correct? You didn’t mention to start with a half blown ball, that‘s why I am asking.