How fast is your heart going when nothing is happening?
Worksheet, five minutes, everyone plays. Round one is a guess: each person writes two numbers — their own resting heart rate, and the person on their left. No watches, no phones, no asking. Closest guess gets to look smug until the next round.
Round two, measure it for real. Sit still for five minutes first — no caffeine, nobody who just ran up the stairs. Two fingers on the inside of the wrist, below the thumb, press lightly. Count the beats for 30 seconds, then double it. That is beats per minute. British Heart Foundation: how to check your pulse.
Round three, read the band, not the ranking. Ages 7–9 usually sit between 70 and 110 beats per minute. Everyone 10 and over — the teenager included — between 60 and 100. A well-trained athlete can sit at 40–60. Very different numbers, all of them normal. UCSF Benioff Children's Hospitals: pulse ranges by age.
Round four, the comeback test. Twenty jumping jacks, then sit down. Count at 30 seconds, at one minute, at two minutes. The faster your number drops back towards the quiet one, the fitter your heart usually is. American Heart Association: all about heart rate.
Round five, the why. Hand on your chest. A fitter heart pushes more blood with each squeeze, so it needs fewer squeezes to do the same job. A child's heart is smaller and pushes less per beat, so it beats faster. That is size, not laziness. Cleveland Clinic: heart rate and kids.
Round six, the one-percent move. Tomorrow morning, same chair, same time, measure again. One number is a photo. Four numbers in a row is a story — and a story is the only thing you can actually change.
Your resting heart rate is not a score out of anything. It is the sound of your heart doing the smallest job it can — and a fitter heart can do that job with fewer beats.
Resting heart rate means beats per minute while you are sitting or lying down, calm and well. For most adults that lands between 60 and 100; athletes often sit at 40–60 because their heart muscle is in good condition and does not need to work as hard. The bands move with age: a 7–9-year-old usually runs 70–110, while everyone 10 and over runs 60–100. At 70 beats a minute, that quiet drum is still beating 100,800 times a day.
So why does the nine-year-old usually beat faster than the thirteen-year-old? Not fitness — plumbing. A child's heart is smaller, pushes less blood per beat and holds less blood overall, so the same job needs more beats. Compare a 9-year-old at 95 with a teenager at 68 and you are comparing engine sizes, not training programmes. That is also why a kid's number can look alarming next to an adult's and still be completely normal.
Plenty of things move the number without meaning anything: heat, caffeine, stress, a poor night's sleep, dehydration, a cold coming on. One reading is a photo, which is why the measurement is supposed to happen the same way at the same time each day. The more useful signal is recovery — how fast the number falls after exercise. Regular exercise makes that drop quicker, and no single reading proves anything on its own. A resting rate that stays above the band, or sits below it with dizziness or fainting, is a doctor question, not a family competition.