I think thatās a comment for your average, non-athletic, in shape people.
Target Heart Rate and Estimated Maximum Heart Rate | Physical Activity | CDC
One way of monitoring physical activity intensity is to determine whether a person's pulse or heart rate is within the target zone during physical activity. Learn more...
www.cdc.gov
For moderate-intensity physical activity, your target heart rate should be between 64% and 76%1,2 of your maximum heart rate. You can estimate your maximum heart rate based on your age. To estimate your maximum age-related heart rate, subtract your age from 220. For example, for a 50-year-old person, the estimated maximum age-related heart rate would be calculated as 220 ā 50 years = 170 beats per minute (bpm).