Such WBC then makes sure that the robot reaches both it's task goals (eg. grab something, with 1, 2 arms), as well as it's (dynamic) stability goals so it doesn't fall over. They are also capable of choreographing the robot pretty accurately as we say in earlier videos. But what is most very impressive to me is the robot using the mass and momentum of things it grabs to keep stable or move itself. In one of the videos it grabs a big piece of wood and uses it to turn itself around while jumping. Amazing! Controlling that in terms of dynamics is... wow!