Re: Tamura's warm up
Tamura sensei's warm-ups are very rewarding and fascinating. At the seminar he had in our dojo last year, he actually explained quite a lot. Unfortunately, I have to confess that I don't trust my understanding well enough to try to repeat it.
Me too, I have the impression that they are do-in exercises. Michio Kushi has written a book about do-in that I have found worth reading: "The Book of Do-In".