With the explosion of new technologies, the importance of physical activity - at home, at work or during leisure time - continues to decline. Worldwide, 38% of the adult population falls short of the World Health Organization's recommendations in this area. This figure is twice as high in developed countries: one French person in two admits to doing no sport at all. While we know the undeniable beneficial effects of exercise on the body and mind, it's often difficult to resist the - quite natural - temptation to make the least effort.