Saying osu is one of the practices at the dojo that builds spirit and community. The translation of this Japanese term indicates its purpose. Literally, osu translates to mean acknowledgment and yes, and figuratively it means accepting the spirit of challenge. Of course, in martial arts and in life there are many challenges and we, as practitioners of this art, understand this and acknowledge that fact. Osu, is often said at the appropriate time with sincerity and spirit. Often it is said at the beginning and ending of class. Competitive fighters often use this word as a mental cue to prepare for battle before the fight. It switches the spirit on.