Sometimes during my MAF training, my heart rate shoots past my MAF HR. Is this OK?

Always try to avoid this problem. In some people, going above the MAF HR by even by two or three beats triggers a mildly anaerobic response in the body -- something you want to avoid immediately if your goal is to quickly build significant aerobic function, endurance and good health. Walking as your HR exceeds the MAF limit will solve the problem. 

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