So many  gymnastic postures require us to squeeze our butt checks together, but why wait till you are in the gym to build up your “Ass Capacity”.

Why not sneak in the odd 10 second squeeze when no one is watching. You might as well squeeze your ankles together to, and maybe make sure the butt squeeze takes you into a flat backed position.

You can turn wasted Tube or Bus Stop time, into  useful handstand practice time