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The basic idea underlying cardiorespiratory or aerobic training is to place greater demands on the _______ than what’s required during rest. A. muscles B. lungs C. heart D. arteries
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The basic idea underlying cardiorespiratory or aerobic training is to place greater demands on the _______ than what’s required during rest. A. muscles B. lungs C. heart D. arteries

User Moscas
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the heart put in the demands
User Alois
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the heart because it puts increased demands on he heart to strengthen heart and cardiac muscles
User Dalvtor
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