Big Dog's Backyard Ultra: The toughest, weirdest race you've never heard of

The format might be simple - winning this race is anything but. Big Dog's Backyard Ultra is an unusually punishing challenge.

Big Dog's Backyard Ultra: The toughest, weirdest race you've never heard of
The format might be simple - winning this race is anything but. Big Dog's Backyard Ultra is an unusually punishing challenge.

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