Hi there welcome to the forums!

I like looking things up, and I managed to find a Thai Boxing club in Fort Collins, CO. See here: http://www.usmta.com/CAMP-SCHOOL-FRAME.htm (click on the Colorado State Flag)

Note though that the link for Alpine Martial Arts isn't working, but there is a telephone number.

Hope this helps & good luck.
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"Let your food be your medicine, and your medicine be your food" Hippocrates.