Participants of the Beijing Color Run

Photos: Lintao Zhang/Getty Images

'Happiest 5k on the Planet'

Competitors celebrate at the finish line of Beijing's first annual Color Run on Aug. 10 at the International Garden Expo park.

Unlike other 5k events, this untimed race emphasizes fun over competition. After kicking off the race in white clothes, runners mark each kilometer by passing through "color stations," where they are pelted with colorful, nontoxic dye made of cornstarch.

Ever since the first Color Run debuted January 2012 in Phoenix, Ariz., the family friendly event has expanded to more than 100 cities across the globe.

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Young man is attacked with blue dye at Color Run
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Runners cool off
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Runners make their way through the yellow dye section
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A person is attacked with red dye
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A family runs through the blue dye section
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Runners collapse in a pile at the yellow section
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A runner steps in blue dye at the Color Run
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Catie Leary is a photo editor at Mother Nature Network. Follow her on Twitter and Google+.
 

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