Aerobic training heart rate is the number that tells you honestly whether you burned fat today or just spent time. In this guide we look at how to measure your pulse, how to find your maximum heart rate, and which of the five intensity zones serves which goal.
A quick reminder from the previous part: results come when you fit in at least three 20-minute aerobic sessions a week. Each session starts with a 5–10 min warm-up (50–60% of max HR) and ends with a 5–10 minute cool-down at the same intensity. The main weight-bearing muscles are stretched both before and afterwards.
Why aerobic training heart rate decides the result
The same 30-minute run can be an easy warm-up or a grueling interval session — the difference is heart rate. If you don’t know which zone you’re in, you don’t know what your body gets out of the training. One person burns fat, another builds endurance, a third uses up only carbohydrates. Heart rate is the compass that makes the difference visible.
The rule is simple: set your goal before you choose a zone. Want to lower your blood pressure? One zone. Want to melt that winter belly? Another. Preparing for a half marathon? A third. No single training plan suits everyone, but one principle does — measure your heart rate.
How to measure your aerobic training heart rate
A heart rate monitor gives the most accurate result — a chest strap sensor or, these days, most smartwatches. It shows exactly where you are in real time and records the whole session.
No watch? Manual measurement works. Place your fingers on the carotid artery in your neck, count your heartbeats over 6 seconds and multiply by ten. For example, 12 beats in 6 seconds means a heart rate of 120 bpm. The same logic applies to 10 seconds (multiply by six) or 20 seconds (multiply by three). The method is quick, but it gives you only a snapshot — the number can change within the next minute.
A practical rhythm: check your pulse in the middle of the session at the 5-minute mark and again right before the cool-down. That way you can see whether the planned intensity actually held.
Maximum heart rate
Every zone’s percentage is based on your max HR — so the first step is to know that number. The simpler formula: 220 minus your age in years. For a 40-year-old man the maximum is 220 − 40 = 180 bpm. The number naturally declines as you get older.
A more precise method is a lab test on a cycle ergometer, where doctors record your actual maximum under a stepwise increasing training load. For the average recreational exerciser this isn’t necessary — the 220 formula is a good enough starting point.
Five zones where aerobic training heart rate works
1. Health zone — 50–60% of max
Easy walking or very slow jogging. Suits beginners, people who are recovering, and trainees with low fitness levels. Energy comes from 85% fat, 10% carbohydrate and 5% protein. Few calories are burned, but blood pressure drops, cholesterol improves and the joints get a gentle training load. A good introduction, not the end stage of training.
2. Fitness zone — 60–70% of max
The best range for burning fat. The energy split stays similar — about 85% fat, 10% carbohydrate, 5% protein — but the intensity of the work is higher, so calorie burn is higher too. Studies show that it is in this zone that fatty acid molecules are “pulled” out of fat cells fastest and transported to the muscle to be burned. If your goal is to melt belly fat, stay here.
3. Aerobic zone — 70–80% of max
The endurance zone. The diameter and number of blood vessels increase, lung ventilation improves, stroke volume grows and resting heart rate drops. Energy splits into 50% carbohydrate, 50% fat and up to 1% protein. Training in this zone for long stretches makes the heart stronger and more capable — this is where marathon runners’ results come from.
4. Anaerobic zone — 80–90% of max
Maximal oxygen uptake improves, lactate tolerance rises and recovery gets faster. The total number of calories burned is higher than in the previous three zones. Energy: 85% carbohydrate, 15% fat, up to 1% protein. You won’t be making long conversation here — breathing is hard.
5. Maximum zone — 90–100% of max
The anaerobic threshold has been crossed. Calorie burn is at its highest, but the share of fat is the lowest: 90% carbohydrate, 10% fat, under 1% protein. Even trained athletes can’t stay here for more than 15–20 minutes, and for many people 5 min is too much. Most recreational exercisers never get here. In athletes’ interval training, the main work is done in the aerobic zone, and every 10 min they climb to maximum for 1–2 minutes, then drop back.
How to choose the right zone
Beginner: two to three weeks in the health zone to let your body adapt. After that, move on to the fitness zone.
Weight loss: main work in the fitness zone, sessions of 40–60 min, three to four times a week.
Endurance athlete: two long sessions in the aerobic zone + one short interval session in the anaerobic zone.
One thing I’ve noticed in my own training: the dark, cold Estonian winter pulls your heart rate down. A jog at the same pace in September and in January won’t put you in the same zone. In winter it’s worth checking your heart rate more often, because if you go by feel alone, you can end up training at too low an intensity without noticing.
FAQ
Is the 220 formula accurate enough?
For the average recreational exerciser, yes. The individual deviation can be 10–15 beats, but that doesn’t change the logic of the zones. If you’ve been training systematically for several years, lab testing is worth doing.
What if my heart rate doesn’t rise into the planned zone?
That’s a good sign: your functional capacity has improved and the old training load is no longer enough. Add incline, speed or resistance until you’re back in your target zone.
Do you always have to measure your heart rate?
Definitely in the first few months. Later you learn to read your body: your breathing rate and your ability to talk give a pretty good estimate. But check tests once or twice a month help make sure that how you feel and reality line up.
Author: Janar Rückenberg
Source: WHO – physical activity.
Come and train! ArtGym
