This year marks the 52nd anniversary of the Boulder Mountain ... and fitness goal. Unlike running, however, passing other participants on narrow, slippery trails adds an extra layer of difficulty.

The BOLDERBoulder 10K continues to become one of the country's largest running events ... The annual May race runs through central Boulder and the University of Colorado campus before finishing ...

For information about Flatiron trails, visit the City of Boulder website. These jaw-dropping rock walls flanking Green Mountain have become the symbol of the city, with many Boulder businesses ...