An important component of keeping your body in top physical condition is your body fluid level. Without your body being in top physical condition, your workout will not be as effective and you will be more prone to injury.
As you exercise, your internal body temperature rises, leading to the body releasing internal fluid to the outside via millions of sweat glands and heightened respiration. As the high temperature sweat evaporates off your skin, heat is taken with it, allowing your body to cool down again.
That internal temperature regulation system is vital to remaining healthy, but losing too much of that fluid can also be problematic. Strenuous activity that is conducted during workouts can lead to a person losing 3 quarts or more of fluid per hour. As you lose more fluid, the performance of your body decreases.
Your cardiovascular system can also suffer from excessive fluid loss, as dizziness, muscle cramps, and even heat stroke can result.
Professional experts recommend that you regularly replace water and electrolytes (which includes sodium, potassium, and other minerals,) by drinking a sports drink (like Gatorade, Powerade, etc.) before, during, and after a workout. How much sports drink you should consume will depend on your body weight and type, your tendency to sweat, the external temperature you are working out in, and other variables, but here are some general guidelines to follow.
You should drink around 18oz (0.53 liter) a few hours before beginning your workout, then another 10oz (0.3 liter) around 15 minutes before starting your warm-up routine. For every hour you work out, you should drink at least 30oz (0.89 liter) more every hour you work out. Finally, after cooling down for a few minutes after your workout, you should drink another 20oz (0.59 liter.

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