I'll give you a question, please answer with step-by-step reasoning process. The trainer told him to keep doing the same exercise, he said he had to keep doing it until he what?\nOptions:\n- get tired\n- lose weight\n- aerobic activity\n- fatigue\n- drink water

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He get tired by doing same exercise. On being told by the trainer, he kept doing the same exercise until he get tired.
The answer: get tired.
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