Final answer:
The most important reason to check your heart rate while exercising is to make sure your pulse doesn't go too high and ensure you stay in your target heart rate range.
Step-by-step explanation:
The most important reason to check your heart rate while exercising is to make sure your pulse doesn't go too high and ensure you stay in your target heart rate range. This is important because exercising at a heart rate that is too high can put excess strain on your heart and increase the risk of health complications. By monitoring your heart rate, you can ensure that you are exercising at a safe and effective intensity level.
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