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Bring both! Right West of Broomfield there is a good cross country course for running, about 10 miles of track, I go out there often. If you want a challenge, head up to Magnolia Rd where the Buff cross country runners train (head up Mag Rd outside of Boulder until it turns to dirt, then start there). It's about 8,500ft!
As far as biking goes, you can start from Broomfield, but I prefer to start in Boulder and do big 60-100 mile loops through the flatirons.
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