I would have used the search function, but I didn't know how to word it. In BJJ and MMA a lot of BJJ practitioners put there hands behind their heads when they are on their back and the other guy is above them (ie: Sakuraba v. Belfort). Why do they do this? What does is mean? Thanks in advance.
It tires your neck and abs out not to, and the hands behind the head mean you're ready to block punches/brace for impact.
Good BJJ guys never lay flat on their backs. They are always arching up and moving their hips. Putting the hand on the back of your head gives your abs and neck a little rest.
