It’s Time to Make a Coffee Run...

By Gina Kolata

WELDON JOHNSON first tried caffeine as a performance enhancer in 1998. He was not a coffee drinker but had heard that caffeine could make him run faster. So he went to a convenience store before a race and drank a cup of coffee.

For the first time in his life, he ran 10 kilometers in less than 30 minutes.

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