This document summarizes an ethnographic study conducted at two youth centers exploring how physical activity fits into the daily lives of teenagers and how they perceive physical activity. Participant observation and interviews were conducted with over 50 young people from three distinct groups. Key themes that emerged included how social contexts influence engagement in physical activity and its role in weight and body management. The study found that weight management discourses are not always beneficial to health in adolescence, and that this transitional life phase affects engagement in physical activity. Ethnographic methods provided insights into these issues in public health research.