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In page Mark Spitz:

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In an era when other swimmers, male and female, were shaving body hair, he swam with a moustache. When asked why he initially grew one, he stated: "I grew the moustache because a coach in college said I couldn't grow one."[1] Spitz said he originally grew the moustache as a form of rebellion against the clean-cut look imposed on him in college. "It took a long time to grow," he said.[2] It took four months to grow, but Spitz was proud of it, he decided the moustache was a "good-luck piece".[citation needed]