Runners and walkers participate in the 2016 Bolder Boulder 10K. More than 50,000 participate each year.

---

Size: 3712px × 2920px
Location: Boulder, CO
Photo credit: © Ron's Boulder and Colorado Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: .., 10, 10k, 2016, 38th, america, american, americans, athletes, blue, bolder, boulder, challenge, challenges, challenging, child, city, colorado, colors, competition, competitor, day, exercise, exertion, flag, international, jog, kilometer, memorial, men, pace, patriotic, personal, race, red, run, runner, sam, states, strive, uncle, united, usa, walk, waver, waving, white