If 33-year-old Jacob is cross-training and his current heart rate is 137 beats/min, exercising at his current level of exertion _____

a. could potentially be dangerous for a non-athlete of his age
b. is not intense enough to improve his cardiovascular fitness
c. will help improve his cardiovascular fitness
d. is appropriate for a competitive athlete in training


Answer: c. will help improve his cardiovascular fitness

Nutritional Science

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