Tough Mudder Race in California Gets Even Tougher After Illness

More than 300 California runners have become sick with an unidentified virus following a mud run.

Health advisory issued for participants of 'Tough Mudder' race in Sonoma County – NBC Bay Area

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10 Races for Your OCR Bucket List – MudGear

Another Solid Reason Not to Do a Mud-Obstacle Run - The Atlantic

This 83-year-old just owned the Tough Mudder race

Tough Mudder wasn't so tough – in fact I enjoyed it, Running

Tough Mudder athletes complain of rash after Sonoma County race

California Tough Mudder participants report bacterial infections

Hundreds at Tough Mudder race reportedly infected in Bay Area

An even tougher Tough Mudder? - The San Diego Union-Tribune