Health equity will be achieved when all demographics have a fair opportunity be healthy. This essay describes the possibility of achieving health equity through physical activity. It presents the social ecological model of physical activity and describes how both microenvironmental and macroenvironmental factors influence one’s ability to participate. There is then a description of watershed moments in American history that negatively influenced the ability of certain demographics to be active today. It then describes groups participating in less physical activity when compared to others. Several public health and political science models are then suggested with specific examples of how they have been implemented in the past to improve health or physical activity. The essay ends by describing the need to build the physical activity evidence among vulnerable populations that tend to be underrepresented in research and explains best practices in engaging these populations in investigative work.