AUSTIN -- It is known as the "Happiest 5K on the Planet."
There's no winner, the race isn't timed, the only requirement is that you wear white and there's just one rule:
"To let go of your inhibitions and enjoy yourself really," said Race Director Lance Duncan.
It's The Color Run. Saturday morning participants trotted through four zones where enthusiastic volunteers cover them in color.
And just in case the runners were a little to clean, there was a color throw at the finish line to make sure everyone is drenched in dye.
The Color Run is an international running tour that promotes healthy living. The first 5K event was last year. This year, organizers expect one million people to participate.
"We did 60 events the first year and we're on track to do about 120 this year," said Duncan.
Organizers credit the success of the run with the laid back atmosphere. They say taking the competition out of the equation promotes friends and families alike to get in on the action.
And it's all for a good cause. The Color Run company donates money to charities working in the Austin community. This year the two recipients are ColorCancer and Back on My Feet.
ColorCancer spreads awareness and raises money for cancer related community events.
Back on My Feet uses running to empower the homeless and help them get off the street.