Physical activity (PA) has been associated with a multitude of beneficial mental and physical outcomes. It is well documented, however, that there are health disparities and inequities for segments of the population, especially as related to PA. Engagement of traditionally minoritized populations into research is essential for justice in health. We discuss a community engagement model that can be used for recruiting and retaining traditionally minoritized populations into PA research, and then we go into three major ethnic/racial groups in the United States: Latinos, African Americans, and Asian Americans. Background information of each group, cultural values that play a role in health for each of the groups, and research demonstrating how culture plays a role in the formation and implementation of PA interventions in these groups is presented.