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March 24, 2018


8 intervals. 24 hours. A free virtual event open for everyone — everywhere!

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March 24, 2018


8 intervals. 24 hours. A free virtual event open for everyone — everywhere!

What is Ultra interval challenge?

A FREE virtual event presented by pace on earth

Run a 10K every 3 hours over a 24-hour period (everyone starts at the same time, regardless of where you are on our planet), complete some fun challenges along the way and post your results using Facebook, Twitter or Instagram. Depending on where you live, you start on different times.  #ultraintervalchallenge is a great way to train endurance and determination — perfect for aspiring ultrarunners and anyone who’s in for a challenge! 

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Order your T-Shirt

Show the world that you can take on a challenge — and that you care about nature. Order your very own Ultra Interval Challenge T-shirt made from 100% Eco Friendly Organic Cotton. FREE SHIPPING WORLDWIDE!

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