Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Sergei Bachlakov)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Sergei Bachlakov)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Sergei Bachlakov)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Sergei Bachlakov)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Sergei Bachlakov)

 

A runner takes part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Sergei Bachlakov)

 

A runner takes part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Sergei Bachlakov)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Sergei Bachlakov)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Sergei Bachlakov)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Liang Sen)

 

A runner takes part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Liang Sen)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Liang Sen)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Liang Sen)

 

A runner takes part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Liang Sen)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Liang Sen)

 

A runner takes part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Liang Sen)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Liang Sen)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Liang Sen)

 

Runners take part in the Colour Run in Vancouver, Canada, Sept. 14, 2013. Known as the happiest 5 km on the planet, Colour Run is a joyful and good-feeling event as participants run through different colours powder during the course. (Xinhua/Liang Sen)