There are a number of reasons why someone may be dehydrated. They may have pushed it too hard in a recent training session, they may be recovering from a number of illnesses, they may have had too much to eat and drink leading to their system feeling a little off, or they may have gotten behind on drinking their glasses of water each day and are starting to feel a little worse for the wear. Some of the most common symptoms of dehydration are extreme thirst, fatigue, dizziness, and frequent urina...