A commonly heard phrase when leaving a Japanese dojo is, “Otsukaresama deshita.” Otsukaresama deshita translates as a person who is tired but the phrase means, “Thank you for all your hard work.”  The Japanese place a high amount of importance on people “Giving it their all” and thus when one is tired they must have given it their all.  To acknowledge this obvious herculean effort one says, “Otsukaresama deshita” with a shallow bow to others as they leave.  The proper response is also, “Otsukaresama deshita” to acknowledge that person's efforts as well.