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If your urine becomes dark ONLY after exercise, then the cause is most probably release of myoglobin in blood stream which occurs after muscle breakdown. Myoglobin turns the urine color dark. If this is a continuous process, then you might be having Rhabdomyolysis. This is again, breakdown of muscle after injury/exercise etc. Excessive myoglobin can affect the kidneys. I would recommend you to consult your medical specialist for a detailed evaluation and further treatment depending on confirmation of diagnosis.
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