In order to establish your sweat rate is quite simple. Take your weight before and after an hour of physical activity and subtract the two. Take the answer and multiply it with 1 000 to change it over to grams. The difference in grams is the similar amount of fluids you lost during an hour of activity. This amount you should replace during each hour of similar activities and is known as your sweat rate.
It is important to keep in mind external factors such as the intensity of each session, weather conditions, and the temperature when you exercise when you establish how much fluid you need to consume with future physical activities.