Increases physical stamina: During physical exercise, water loss through sweating causes our performance to deteriorate. This process can also be observed away from training. According to the specialist, some professions require a very great effort of the body, and consequently, there is a greater loss of water by perspiration. "A postman or a delivery boy, for example, if they do not take care of the hydration, they will not be able to do a good job, since they make a great physical effort during the day." In addition to hydration, water helps control body temperature, and thus improves performance in some sports.