The Japanese way of training...

[Mekugi]

This is typical behavior in Japan- it solidifies the seniority system and it assures that older members can defeat the younger, stronger ones. They break down newcomers physically while the seniors rest and gather strength in numbers, then beat the snot out of them (although they are being gentle in this video, many times in Sumo they do go overboard and they have killed people).

http://www.youtube.com/watch?v=Kg5QYCKf-X8&feature=related

Here's the trainer showing everyone who is boss...

http://youtu.be/CEWuyqpf5_w

You see shadows of this in other Japanese martial arts as well.

Here's some media on it: http://youtu.be/0uW0XlQAp1Y