Barkley Marathons: Secret entry, covering 100 miles & like climbing Everest twice - is this the world's toughest race?

It has a secret entry process, climbs the equivalent of conquering Everest twice and clocks in at 100 miles long - the Barkley Marathons could be the world's toughest race.

from BBC Sport - Sport https://ift.tt/2FAQNsO