From children on the soccer field to weight lifters in the gym, the best performance enhancer is plain old water. Athletes risk dehydration because of excessive sweat loss.
Water cools the body during exercise.
A large loss of body fluid can reduce an athlete's ability to perform, and increase the risk of serious heat illness. The symptoms of dehydration are dark urine with small volume, elevated heart rate while resting and a headache. Symptoms include thirst, chills, goose bumps, clammy skin, throbbing heart beat, nausea, muscle pain and spasms. Get into the shade and remove excess clothing. Seen often on the first couple of days of new season.