Base guitarist grimaces while playing for participants at the Bolder Boulder Memorial Day 10K race.

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Runners and walkers participate in the 2016 Bolder Boulder 10K. More than 50,000 participate show up each year, including many internationally respected competitors. About 70,000 spectators also show up. Musicians and bands provide music as an encouragement during the race. For more info:

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Size: 3264px × 4928px
Location: Boulder, Colorado
Photo credit: © Ron's Boulder and Colorado Collection / Alamy / Afripics
License: Licensed
Model Released: No

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