By Mathias Eichler
Winter trails, darkness and all the weather - a fun holiday celebration at Olympia's amazing Squaxin Park. Registration open now.
Maia Pandey for NBC News:
More than 100 people said they contracted bacterial infections after competing in a Tough Mudder challenge on Saturday and Sunday in Sonoma, California.
You dig gross mud pools, let them sit for a few days, and then let hundreds of runners crawl through them. Seems like an obvious recipe for exactly this.
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