The only side effect of too much training is that you get into better shape. There is nothing wrong with that.
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.
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