Nowadays most people fail to reach the recommended level of physical activity despite their conscious intention to be physically active. Research on automatic processes suggest that physical activity is not only regulated by controlled processes (e.g. intentions) but also by automatic processes (e.g. automatic approach and avoidance reactions). However, the neuro-physiological underlying these automatic reactions are still unknown. In this study, we aimed to investigate the neural mechanisms underlying the automatic approach and avoidance reac-tions towards physical activity (PA) and sedentary behavior (SB)...