Use reasoning to lead to the answer of the following question:
What is a reason for hiking?\nOptions:\n- adventure\n- walking\n- becoming tired\n- fatigue\n- exercise
 Reasoning process:
User
Hiking means the activity of going for long walks especially across country for exercise and burning lot more calories per hour than walking. Exercises keep body fit and so hiking is the reason for exercise. Therefore, the final answer is exercise.
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