Traditional karate classes teach formal etiquette such as kneeling and bowing, exercises for training, and basic technique while moving.
Most important is the teaching of kata; without Kata there is no Karate and no art. Kata is a series of movements based on principals of self-defense and executed in a specified series of stepping and moving.
Bunkai is the application of kata with a partner. The two types of Bunkai are Kihon Bunkai, or standard application, and Oyo Bunkaim, or variations on the standard.
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Besides lots of sweating what can I expect in a traditional karate class?