Thank you for the opportunity to help you with your question!
your resting heart rate is best measured when you first wake up in the morning, before you feet leave the sheets.
a stop watch or clock or watch with a second hand , then find your
pulse you can locate your pulse either in your radial artery on your
waist or at your carotid artery in your neck.
then only trick
to measuring your hear rate is that you must use the correct fingers to
do the measuring.your thumb has a light pulse and can create some
confusion when you are counting your beat. its best to use your index
finger and middle finger together
after you find the beat you need to find how many beats occur within 60 seconds.
you will be able to deduce the actual heartbeat at rest. Please let me know if you need any clarification. I'm always happy to answer your questions.