Physical aspects of patterns
It is physically taxing to perform a pattern the way its is supposed to be performed. Each movement should be precise with maximum effort. Each technique should be performed as if your life depended on it doing its job. The body is constantly tensing and relaxing. When you finish a pattern, you should be physically exhausted; you gave it everything you had. It would be impossible for you to immediately perform the pattern again with the same intensity. When you practice your patterns, you cannot maintain this level of exertion very long, so you back off some so that you may practice longer and perfect you movements.