Dehydration is related to many issues that arise during training or events, the most common are:
  1. Lack of proper electrolyte replacement, which can lead to a decreased ability to use fluids. Endurolytes are a key component to ANY workout.
    Further Reading: The Endurolytes Rationale

  2. Over hydration can lead to a flushing effect, which lowers electrolytes and can lead to fluid simply being sweated out or lost through urination.
    Further Reading: The Heat Is On: Staying Cool in the Heat