This paper presents a case study on using research and law to change public health policy. The City Project (a legal and policy advocacy organization), working with teachers and school officials, is using social science and legal research to promote changes in public policy that hopefully will result in better and more equitably delivered physical education in public schools in Los Angeles, California. The major goals are, first, to help students learn the skills and knowledge to move more, eat well, stay healthy, and do their best in school and in life; second, to alleviate unfair disparities based on race, ethnicity, and income; and third, to engage, educate, and empower people to improve public education and health. This case study shows that academics can work with lawyers and other practitioners, including teachers and organizers, to maximize the impact of their research. The strategic, organized course of action has four major elements. First, the teachers’ union – United Teachers of Los Angeles – organized a public campaign to support physical education. Second, attorneys filed an administrative complaint on behalf of parents, youth groups, and health advocates under civil rights and education laws to require the school district to enforce physical education requirements. Third, in response to the campaign and complaint, the Board of Education of the Los Angeles Unified School District unanimously adopted a resolution to enforce physical education laws. Fourth, the teachers, attorneys, and school officials are now working on an implementation plan to enforce the physical education laws and resolution, and resolve the complaint. The goal has been to persuade the school district to provide quality physical education without litigation, but to resort to litigation if necessary. School officials have agreed to work with the teachers’ union and The City Project, and litigation has not been necessary to date. The message from The City Project and teachers’ union to the school officials is simple: Do you want to get married? And, by the way, we have a gun. The campaign, complaint, resolution, and implementation plan draw heavily on research published by the California Endowment (a philanthropy committed to improving equity in health in California) (1). Persuading other school districts to enforce physical education requirements is the next challenge. Thirty-seven school districts throughout California did not enforce physical education requirements in 2006. For example, the Los Angeles school district does not enforce state law requiring an average of 20 min per day of physical education in elementary school (2). The Los Angeles Unified School District is the second largest school district in the United States.  What Los Angeles does is a crucible for change elsewhere.