The headline says it all: "Inequality in the Built Environment Underlies Key Health Disparities in Physical Activity and Obesity." That's the bottom line from a new study in the journal Pediatrics, which finds that areas with higher socio-economic status were significantly more likely than lower-economic and high-minority blocks to have one or more recreational facilities that enable physical activity. This is the first study to look at the disparity in access to recreation sites and the activity and overweight patterns in U.S. teens.