In fact, you don't need to replenish water in time when running, because your body will adjust as much as possible when running. In a short time, your body will not be short of water. If we always replenish water, it is not good for our whole body regulation, but we really need to replenish water in time after exercise, and we also need to replenish water after long-term exercise. Others don't need special supplements. Only represents personal views.