Re: Zazen necessary for training
I've read several books about Zazen, and must confess that only have had one class.
Many times before a class, I'll sit in Zazen and focus on my breathing. I've always felt more energy and clarity during a lesson after I did some Zazen.
There have been many physiological studies on meditation and breathing, all coming back with positive results. So scientifically, I must agree that Zazen in very beneficial for training, but maybe not necessary.