how to figure exercising heart rate
For example, say your age is 45 and you want to figure out your target heart rate zone for vigorous intensity exercise. Subtract 45 from 220 to get 175 â this is your maximum heart rate. To get the lower end of your target zone, multiply 175 by 0.7 to get 123. To get the higher end, multiply 175 by 0.85 to get 149. So your target heart rate zone for vigorous exercise intensity is 123 to 149 beats per minute.