What it is saying is that someone who was a world champion and who takes care of himself with a 17-year rest and applies the proper training techniques and perseverance could be successful.
There's a difference between over-training and over-exercising. Over-training can be you're trying to do something at high performance, but when you're over-exercising it just means that you don't have a life. And there are obviously people who go to that extreme.
The only side effect of too much training is that you get into better shape. There is nothing wrong with that.
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