[The physical activity paradox.].

Recent discoveries have shown that the effects of physical activity on health are not the same in all its domains. In particular, the health effects of physical activity differ not only in terms of modality and intensity, but also based on the context in which it is carried out. Several studies have observed that those who do a lot of physical activity at work tend to have worse health outcomes than those who do less physical activity at work but more exercise in their free time. This phenomenon has been defined as the "physical activity paradox". However, it is worth reporting that differences in health outcomes have been observed for different socioeconomic positions and that more favorable socioeconomic positions tend to have healthier lifestyles.