Check if the person is breathing or not is the answer
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Rather than stopping completely, Luis should lower the speed of the treadmill, making the aerobic lower, and let his heart rate gradually enter his target range. Stopping completely will interrupt the workout and could negatively impact his muscles and joints, and slowing down the treadmill will allow his body to gradually settle into a new aerobic intensity that's closer to his target.
Answer:
C. choosing which players should be substituted
