Funny you should ask...
I have always thought that golfers should train like real athletes, and that one day, the tour would have a bunch of guys that look more like Guy McGinnis—a guy I grew up with that played major college basketball with Joe Dumars—then there would be guys looking like Bob Murphy.
I played 5A high school football, and trained 356 days a year. I ran so many stadium steps, that I could run them almost as fast as I could a simple incline. I was so good at all the tire drills, that they had to let me go first all the time or I would run over the guy in front of me.
Oh, and I played golf on the golf team, and with the worst technique of all time, would up with a college scholarship.
By the time I was 24, I was 20 pounds heavier than I was at Free Safety, a couple of seconds in the forty slower, and a lot better golfer, because I had researched the heck out of the swing and taught myself to play better.
But my body sucked.
I told my pal Todd Nunez in early 1987 that I was going to get in world-class shape and go see Ben Doyle and see if I could hit it a bunch better.
He laughed and said "good shape" would be just fine.
I disagreed.
Now "world-class" shape I wasn't, by August of 1987, I was down to 151 pounds, 5-8 body fat, could bench press 30 more pounds, and did a full bodt workout four days a week.
Oh, I almost forgot...I played 10 hours of Basketball a week, walked 108 holes a week, played football twice a week for about 6 hours, and went out and danced a couple of night a week.
I had gone to see Ben, and besides looking like a totally different golfer, I swung like a real golfer as well. If I'd have known about the D-Plane, and understood the 9 shots of the Manzella Matrix Short Game, I would have been pretty good.
As it was, I was light years better than I had ever been.
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Being in big-time shape, with strength and flexibility is HUGE in golf.
So, what do I think of TPI?
When someone stands up at a PGA Teaching Summit, and says that folks coming over the top because of their bodies, when I have seen those type folks get fixed in 20 minutes on my lesson tee, I have to be a bit lukewarm on what they stand for.
My personal belief is this:
After talking to some renown people on the subject, my recommendation is to train the WHOLE BODY. If a zenolink or TPI trainer will do it, great.
I am very apprehensive about recommending "spot" training. And I am not saying any of these "methodologies" suggest spot training either. I just think whole body is better.
And I can fix folks without them having to be in shape.
And I am not saying it wouldn't be easier if they were in better shape.
I am saying I evaluate folks WHILE I AM FIXING THEM. that is a big part of teaching....figuring out what THAT PERSON in front of you can and can't do, and teaching around their limitattions.
But I want to go on record as saying, I think anyone wanting to play their best golf, should go find a top notch athletic trainer, and train their whole body hard.