subtract your age from 180: Those with heart disease or other medical conditions should subtract 10 from Maffetone’s equation; if you have asthma or allergies or have not exercised before, subtract 5. Competitive athletes who have been training for more than two years, add 5. This works out to around 80 percent of maximum capacity for a man of my age. Anaerobic states usually hit at 80 percent, or the stage at which it becomes difficult to speak in full sentences. “Know Your Target Heart Rates for Exercise, Losing Weight and Health,” Heart.org,
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