Your heart rate is the number of times your heart beats in one minute.
This means your heart is either working too hard or not hard enough to support your body.
To take your brachial pulse, bend your elbow slightly and turn your forearm palm-side up.

Verywell / Danie Drankwalter
However, very active, athletic individuals may have healthy heart rates below 60 beats per minute.
A healthy resting heart rate falls within the range of 60 to 100 beats per minute.
doi: 10.2196/cardio.8802
American Heart Association.All About Heart Rate (Pulse).