Use activity level as a gauge
We lose fluids in just the normal course of daily living. Everything from breathing to eliminating solid and liquid waste reduces our fluid levels. How much you lose in a given day will depend on additional factors, such as how active you are. Generally, the more active you are the more fluids you will lose and need to replenish.
Because of concerns about calories, carbs and sugar, experts often recommend that water is sufficient for the task if exercise lasts less than an hour or isn’t particularly strenuous. A sports recovery drink is a better option when you exercise for more than 60 minutes or for a shorter, hard work out that causes you to sweat (i.e. lose a lot of fluid).
The benefits of sports recovery drinks
Sports drinks are popular among marathoners because they replenish lost fluids and electrolytes while providing fuel for the road. You don’t need to be a marathoner to benefit from sports drinks. If you work out for at least an hour or you work out vigorously enough to lose salt through sweating, a sports recovery drink can be just the right fuel for your fitness plans.