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Fitness Underground is no longer operating out of Collier's Hill. We'll be in our new space at 149 S Briggs St. (next door to Cristos) in mid-April!
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WELCOME TO THE UNDERGROUND
A Community of Fitness
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Active w/ Ash Online
Making virtual feel personal
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ONSITE AND VIRTUAL
Flexible Options
Onsite Classes: For those local to the Erie, Colorado area, we offer small-group boot camp style classes in an intimate boutique location utilizing: battle ropes, bosu, free weights, booty sprout, TRX, slam balls, the Tank, punching bags and more.
Virtual Classes: Get inspired and workout anywhere with little to no equipment! Our community works out in their living rooms, garages, basements, backyards, hotel rooms, parks, and more.
Click to learn more:
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Take a Tour
Watch a guided tour of the Fitness Underground by owner and instructor, Ashley Marks.
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VISIT BOOKING PAGE
Book a class, purchase a membership, and see reviews:
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