[Exercise and sports: an undervalued health resource].

The importance of physical activity for health is internationally recognised. The physiological and the epidemiological evidence for health effects of both moderate and vigorous intensity exercise is demonstrated and a "Physical Activity Pyramid" is recommended: Half an hour of moderate intensity activities a day at the base level are already promising substantial health effects. On the second step, additional benefits can be derived from cardiorespiratory fitness training, strength training and stretching exercises. The top of the pyramid can be reached by further sports activities.