The information that the athlete needs to find is he must find his target heart rate zone. The correct option is B.
What is exercise?
Exercise is doing physical activities like running, stretching, or weight lifting to maintain body weight and strength of the body. It is a necessary part of life.
The athlete has to find his target heart rate zone to know the intensity of the heart to calculate his workout intensity.
Thus, option B. He must find his target heart rate zone, is correct.
Learn more about exercise, here:
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