Have you recently made a big change in how much you exercise or what/how much you eat? If not, exercise may not be the problem. Chronic over-exercise, especially if combined with under-eating, can cause fatigue. But if you haven't changed your routine recently, it could be the fatigue has other causes--poor sleep, stress, a medical problem, etc. If it continues, it might be worth mentioning it to your doc.
Hope this helps.
"All your life, you have just been waiting for this moment to arise."
(Lennon & McCartney, "Blackbird")
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