The World Health Organization wants you to “be part of a global movement to make cities healthier.”

The campaign, 1000 Cities 1000 Lives, was launched with the goal to get 1,000 cities around the world to commit to closing off portions of their streets to traffic during the week of April 7-11 for healthy activities, like biking and walking.

So far, the list of participating cities includes Cleveland, Ohio; Sapporo, Japan; and cities with “Car-Free Sundays” in Chile. To register your city for an event, click here.

The campaign will also be collecting stories of “urban health champions” who are taking action to improve public health in their cities.

Read about the impact of urbanization on public health here.

Connect with the campaign on Facebook or through its custom social network on Ning.