Karate begins and ends with respect, so anytime we enter or leave the hall we must bow into the Dojo. It is customary to bow at the beginning and end of the lesson. The teacher should be addressed as Sensei once the lesson is in progress Once the lesson starts it is customary not to talk, unless asking or answering a question It is up to each student to keep their finger and toe nails cut to a reasonable length (it is surprisingly easy to cut someone if you have long nails). When partnering  another student it is ettiquette to bow before starting training together (the lower grade should bow lower than the higher grade).