Well, an ... interesting development has occured in Keijo!!!!!! After the latest battle, it seems that the main character has suffered nipple failure. That is to say, they no longer get hard. In the words of the head trainer, "you can't be a pro if you can't perk up your nipples!"
Anyway, that aside, Keijo actually does something that I think is pretty neat:
They do this now and then and I think it's a good practice.