Parks and Recreation: Recreate the sandlot experience by carving out time at fields and gyms during prime hours each week for pickup play. Provide equipment and loose supervision, and turn the space over to kids. 

Schools: Commit to providing recess; kids can accumulate up to 40 percent of their total daily physical activity during recess.(16) As is, one-third of third graders do not get the recommended 20 minutes of daily recess, with students in communities of color getting less than others. 

Business: Recognize that surveys of 6- to 12-year-olds say many want to swim, bike, hike, and run more;(17) help connect urban kids with outdoor activities. Incent employees to volunteer, supervise.