As you get old you have to train smarter. Every young guy goes through it; every young guy says I'm invincible, it will never happen to me. The body is like a car or machine, you work it so often that eventually it's going to break down.

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Attribution

Quote text and notes from Wikiquote: John Quinlan (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.