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.
Mark SpitzDo any exercise you want as long as you're willing to do it. You see gym equipment on TV advertisements all the time, but guess what? It's only good if you actually use it.
Mark Spitz