We can see here that determining heart rate by taking radial pulse and then carotid pulse is done thus:
Radial Pulse: Located on the wrist, gently place your index and middle fingers on the radial artery (located on the thumb side of your wrist) and count the number of beats felt in 15 seconds. Multiply that number by 4 to determine beats per minute (bpm).
For the Carotid pulse, it is carried out thus: Found in the neck on either side of the windpipe, gently place your index and middle fingers on the carotid artery and count the number of beats felt in 15 seconds. Multiply that number by 4 to determine beats per minute (bpm).
Various websites, like the American Heart Association or Mayo Clinic, provide calculators or guidelines to determine target heart rate zones based on age, fitness level, and exercise goals.
Understanding your target heart rate zone helps tailor workouts for maximum effectiveness.
During physical activity, if you're unable to comfortably hold a conversation due to breathlessness, it suggests you're working out at a higher intensity.