I get the exhaustion feeling everytime I ride lately!! Last night was the worst, my eyes felt puffy, I had a headache, and I was guzzling down water but it didn't help. And I know I was hydrated to start of with because I had been fasting all day and water helped keep my mind off food. Maybe my fuel stores were to far gone from not eating all day( I did take in a cookie before the ride and a gel during).
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Booyah!!