I hear people asking all the time – Where should my heart rate be when exercising? A person’s maximum heart rate is calculated by: 220 – [Age of the person] Many fitness organizations suggest getting your heart rate between 65-90% of maximum heart rate for 20-60 minutes for healthy adults.

Example: If a 40yr. old person were trying to keep their heart rate between 65-85% of maximum heart rate they would do the following:
220-40 = 180 x 65% = ~120
220-40 = 180 x 85% = ~155
So that person would try and keep their heart rate between ~120-155 beats per minute.

A good rule of thumb if you are new to exercising is to start around 55-65% of your maximum heart rate and slowly increase this range over a few initial weeks. Bear in mind, you should always consult your physician if you are about to begin a new exercise regiment.