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Considerations for fluid intake  This is an excerpt from
Advanced Sports Nutrition by Dan Benardot.  Studies have
demonstrated that athletes experience a degree of voluntary
dehydration, even in the presence of available fluids, that
lowers blood volume and negatively affects performance. Given
the tremendous amount of heat that must be dissipated during
exercise through sweat evaporation, athletes must pursue
strategies that will sustain the hydration state. Failure to do
so will result in poor performance and may also lead to heat
illness.  Temperature regulation represents the balance between
heat produced or received (heat-in) and heat removed (heat-out).
When the body’s temperature regulation system is working
correctly, heat-in and heat-out are in perfect balance, and body
temperature is maintained. The two primary systems for
dissipating, or losing, heat while at rest are (1) moving more
blood to the skin to allow heat dissipation through radiation