What does your resting heart rate tell you? Plot your week and find your band

Your resting heart rate is far more useful as a trend than as a single number. Plot a week of your own morning readings, drag any dot to see how the average and your usual band change, then check whether today's reading is just normal wobble or worth a closer look.

We explain what moves the number (sleep, heat, alcohol, stress, illness), how to measure it the same way each day, and when to check with a doctor instead of a watch.