Why the hour record may be the hardest thing a human can attempt

How far can you pedal a bike in an hour? It's a simple concept, but the hour record has pushed some of the most accomplished cyclists of all-time to their absolute limits, both physically and mentally.
Why is this event so legendarily brutal?
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Video Courtesy of:
NBC Sports
Global Cycling Network
INEOS Grenadiers
Alex Hutchinson for Outside Magazine: www.outsideonl...