This is a precision walking demonstration by a group of Japanese high school students (this was not a club at my high school), with two groups of walkers passing through each other diagonally without running into each other and winding up a writhing pile of bodies on the gym floor. Then they do the same thing WALKING BACKWARDS, then again at a jog! Wow, that is some PRECISE walking. For reference, I have trouble staying on the sidewalk. And I don’t even want to think about my poor mother’s back.