Water is the most abundant, and possibly the most overlooked, substance in the body.
Water is essential for life and ranks, perhaps, secondonly to oxygen as necessary for life. Any way you look at it, our bodies need to stay hydrated. Water plays a key role in all the processes of the body, from moistening oxygen for breathing to helping convert food into energy to carrying nutrients to cells. One of water's many functions, partic- ularly important to the exercising individual, is the regulation of body temperature. Water makes up more than 50 percent of an adult's body weight, more than 75 percent of our muscles and 75 percent of our brains.