Failure to hydrate sufficiently during strenuous outdoor activities, especially during hot weather, can do much more damage than simply not allowing you to enjoy yourself as much. When working out, the body loses water much faster than when you are sedentary. Consequently, you must replace fluids quickly and frequently for your body to perform its best. If not, symptoms like reduced energy, muscle cramps, and dizziness are likely to follow. Whether mountain biking, running, hiking, backpacking, or camping, a good hydration pack can help you stay hydrated and have more fun in the great outdoors.