So someone's knowledge is meaningless unless they are the strongest/fastest at whatever they study? That's absurd.
So your methods worked for you, that doesn't mean that different methods couldn't also work better. The methods that the coaches/trainers are pushing work and are proven through trial and error as well, on a much larger group of athletes than just you. You may have gotten by on natural talent but a good coach will be able to get even more out of you.
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What I'm saying is, When Friel himself wins a tour with his methods, or he imposes his methods on a eventual tour winner, there isn't much point me taking notice. You can follow his methods to the letter but you are not neccesarily going to go on & beat someone who isn't into the science & applies his methods compared to someone who only goes out & trains hard.