Athletic nutrition

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Across
  1. 3. a harmful reduction in the amount of water in the body
  2. 5. a thing added to something else in order to complete or enhance it
  3. 6. extreme tiredness resulting from mental or physical exertion or illness
  4. 7. the highest or best point, value, or level of something
Down
  1. 1. a session of vigorous physical exercise or training
  2. 2. groups of cells with a similar structure working together for a specific function
  3. 4. the ability to endure an unpleasant or difficult process or situation without giving way