Dr. Squat - Dr. Fred Hatfield

So I caught some old highlights on espn classics the other night and they were of Mike Tyson. It's been a long time since I saw those fights. I was a big fan during his early years in the mid 80's.

Anyone know anything about his training? I've looked online for a bit and it all seemed really basic and I think it was but just curious if anyone knows otherwise.

Looking at those old fights is something else. He looks more like a linebacker but wow at the speed and power!