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According to the text, one way to measure an individual's cardiorespiratory fitness is to measure the:

endurance
resting heart rate
flexibility
active heart rate

User JohnAD
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Resting heart rate will tell how strong a person's heart is. Lower heart rate = a stronger heart because it is stronger it pumps more blood with one beat then a weak heart which needs more beats to pump an adequate flow of blood 
User Arjun J Gowda
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