Power-up: a collaborative after-school program to prevent obesity in African American children.

Background: Schools represent a key potential venue for addressing childhood obesity.

Objective: To assess the feasibility of Power-Up, an after-school program to decrease obesity risk among African American children, using community-based participatory research (CBPR) principles.

Methods: Teachers led 14 weekly nutrition and physical activity sessions during afterschool care at the Woodlawn Community School on Chicago's South Side.