“…Thus, it is necessary to have common goals (clear goals as a condition of flow), to experience mutual exchange in the relationship (immediate feedback as a condition of flow), "but also to find new challenges in each other's company" (Csikszentmihalyi, 1990, p. 188) (challenging activities as a condition for flow). Flow experience is of utmost interest for sports and exercise behavior because it is associated with performance in sports (Jackson, Kimiecik, Ford, & Marsh, 1998;Jackson & Roberts, 1992;Jackson, Thomas, Marsh, & Smethurst, 2001;McInman & Grove, 1991). Moreover, due to its rewarding quality, it contributes to the maintenance of sports and exercise behavior which, for example, is an exigence of health-related sports programs (e.g., Csikszentmihalyi et al, 2005).…”