Best Globetrotter

This is one exercise to try: Running in space.

from Reader's Digest Magazine | May 2006

Aboard the International Space Station, astronaut Bill McArthur, 54, ran around the world, literally, while zooming in orbit at 17,500 mph. To show solidarity with pals running a Houston half-marathon on January 15, he strapped himself onto a zero-gravity treadmill and took off.

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