This thesis examines the culture of a couple of Norwegian CrossFit boxes as well as the process of becoming a CrossFitter. The study is based on six months of fieldwork in Eastern Norway. CrossFit is a fitness brand from the US that offers functional fitness training. CrossFit is a controversial form of exercise, as the media have described it both as unhealthy and as an effective form of training. The global movement has also been branded as a health movement and a new sport. In this study, CrossFit presented more similarities to a new type of sport or fitness gym than to a broadly defined health movement. The focus on “functionality” as opposed to “aesthetics” led to fewer gender-based differences compared to other fitness gyms. Informants had seemingly defined the “need for exercise” before starting CrossFit, but their perception of CrossFit as the optimal solution for this need formed through actual participation in classes as well as experiences of the training results. The choice to practice CrossFit appears to occur through a process that entails transformative and ongoing practice. In explaining why they exercise and practice CrossFit, my informants usually emphasized multiple overlapping reasons, including health, recreation, and community. A central part of daily life at the box is learning to perform in the workout of the day (WOD). By learning and developing skills, my informants acquire knowledge about their bodies. Novices could experience the WOD as a rite of passage, whereby one achieves social status and becomes a part of the symbolic community. The WOD has a disciplinary effect and contributes to transform and develop aptitudes and perceptions among participants. In addition to the community, nutrition and functional training are important parts of the CrossFit brand. Nevertheless, in my fieldwork, the nutrition aspect of the global CrossFit discourse was unclear or refused. The functional training represented a more standardized and disembedded kind of cultural exchange that featured uniform movements, equipment, and workouts. The workouts are usually measurable, and this contribute to a naturalization of the fitness knowledge. Despite receiving an overwhelming amount of information about fitness, my informants emphasized the individual body itself as the most effective way to gain knowledge. In this way, they translated and negotiated CrossFit into the Norwegian context.