The range of maximum heart rate within which people should exercise is
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20 percent to 40 percent
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50 percent to 70 percent
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70 percent to 80 percent
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80 percent to 90 percent
C
Correct answer
Explanation
The target heart rate zone for most people during exercise is 70-80% of their maximum heart rate (estimated as 220 minus age). This range provides optimal cardiovascular benefit without excessive strain. Lower intensities may not provide adequate training stimulus; higher intensities increase risk.