Questions The best indicator of the efficiency of exercise is More Videos The best indicator of the efficiency of exercise is A. muscle soreness. B. heart rate. C. sweat rate. D. exhaustion level. Answer: B. heart rate. Related posts: Which of these is NOT a tool that you would need at the incident? using equipment that you haven’t been trained on Related Topics: Up Next Which of the following sentences uses prepositions correctly? Don't Miss Which one of the following statements contains bias? 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