What is the correct way to determine your heart rate per minute during a workout? a. count the pulse in your thumb for 15 seconds by pressing your index finger and thumb together. b. place your index and middle finger on the underside of your wrist, count your pulse for 6 seconds, then multiply by 10. c. place your thumb on your neck, just below the jaw line, count your pulse for 6 seconds, then multiply by 10. d. all of these answers are correct.