Generally, water is the best fluid for your body, hell you're made up of 75% of it!  However, if you exercise for longer than an hour or in a hot/humid environment, you may need to supplement your hydration.  In order to replace the carbohydrates used to fuel exercise and the electrolytes lost in sweat, sports drinks are optimal. They allow you to replenish your sources of vitamins, minerals, and carbohydrates.  The additional nutrients will often stave off feelings of fatigue.  It is also