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Ultramarathon runner Dean Karnazes answers running and ultramarathon questions from Twitter. What can you do to run faster? Why do they give out belt buckles for ultramarathons? How does one fuel up before an ultramarathon? See the full video here: https://t.co/XVhaEvp4sN https://t.co/QABawsqWrB — PolitiTweet.org