Equestrian sport underwent significant changes in Sweden during the twentieth century, from being connected to men and the army to being associated with women and leisure activities. Previous research has shown that a stable culture with masculine military norms still exists in spite of these changes. The purpose of this study is to explore why these norms continue to influence Swedish equestrian sport. Institutional economic theory and gender theory are used to explain continuity and change in stable culture. The source material consists of interviews and document analysis. An important finding is that military norms have been reproduced in the education of the riding instructors.