How do You Determine Your Target Heart Rate?

To figure your target heart rate, you must take subtract your age from 220. You then need to multiply that number by .55 and .85 seperately. For example, a 25 year old would be 220-25=195. You would then take 195*.55=107.25 and then 195*.85=165.75. This example shows that this person should get his or her heart rate above 107.25 but never over 165.75. For optimal results, somewhere in between would be the best decision.