Heart Rate Zones Made Simple: How to Train Safely at Any Age
Last reviewed: 21 September 2026 · 5 trusted sources (listed at the end). Educational content only.
Quick answer: Estimate your maximum heart rate with 208 − 0.7 × age (women: 206 − 0.88 × age), then train mostly in Zone 2 (60–70%), where you can still talk in short sentences. WHO recommends 150–300 minutes of moderate (or 75–150 of vigorous) activity a week plus strength training twice a week. Most healthy people can start light-to-moderate exercise without tests; people with heart disease, diabetes, kidney disease or warning symptoms should get medical clearance first.
Step 1: Estimate your maximum heart rate (MHR)
| Age | 220 − age (old formula) | 208 − 0.7 × age (Tanaka) | 206 − 0.88 × age (women, Gulati) |
|---|---|---|---|
| 20 | 200 | 194 | 188 |
| 30 | 190 | 187 | 180 |
| 40 | 180 | 180 | 171 |
| 50 | 170 | 173 | 162 |
| 60 | 160 | 166 | 154 |
| 70 | 150 | 159 | 145 |
All formulas are averages — your real maximum can be 10–15 beats higher or lower. These formulas and zones do not apply if you take a beta-blocker or another heart-rate-lowering medicine (ivabradine, verapamil, diltiazem), have a pacemaker, or have atrial fibrillation — use effort (RPE) and the talk test instead, and follow your doctor’s advice. The Tanaka formula is more accurate across ages than “220 − age”.
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Wrist optical sensors drift badly during interval work, which is exactly when zone accuracy matters. A chest strap is the affordable way to get near-ECG accuracy, and it pairs with almost any phone app or watch.
Only worth it if you actually train by zones. For walking or general fitness, perceived effort and the talk test work fine and cost nothing.
Step 2: Know the five zones
| Zone | % of max HR | Talk test | Main use |
|---|---|---|---|
| Z1 – Very light | 50–60% | Full sentences | Warm-up, recovery |
| Z2 – Light | 60–70% | Short sentences | Aerobic base, daily health |
| Z3 – Moderate | 70–80% | Phrases only | Stamina |
| Z4 – Hard | 80–90% | A few words | Speed, fitness (VO₂ max) |
| Z5 – Maximal | 90–100% | Can’t talk | Short sprints only |
Karvonen formula (more personal)
Target HR = (MHR − resting HR) × % intensity + resting HR. Example: 40 years, resting HR 60 → MHR 180, reserve 120. At 70%: 120 × 0.7 + 60 = 144 bpm. Measure resting HR in the morning before getting out of bed. Important — the two scales are not the same. The zone table above uses % of maximum HR; Karvonen uses % of heart-rate reserve, and the same number means a harder effort. In this example, 70% of maximum HR is 126 bpm (Zone 2–3), while 70% of reserve is 144 bpm — about 80% of maximum, which is Zone 3–4. Pick one scale and stay with it.
No device? Use effort (RPE) and the talk test
| Effort (0–10) | Feels like | Zone |
|---|---|---|
| 2–3 | Gentle walk | Z1 |
| 4–5 | Brisk walk — you can talk in short sentences | Z2 |
| 6–7 | Jogging — phrases only | Z3 |
| 8–9 | Running/fast cycling — a few words | Z4 |
| 10 | All-out sprint | Z5 |
RPE is especially useful in pregnancy or if you take medicines like beta-blockers that change heart rate.
Step 3: How much, and which zone?
| Goal | What to do |
|---|---|
| General health | At least 150 minutes/week, mostly Zone 2, plus strength training 2+ days (WHO 2020) |
| Fat loss | Build towards 200–300 minutes/week of Zone 2–3, plus strength training and diet changes |
| Endurance | Base in Zone 2; add some Zone 3 tempo and Zone 4 intervals |
| Recovery | Zone 1–2 |
By age (general guide)
- 18–45: mix Zone 2 with some Zone 3–4 and strength training.
- 46–60: prioritise Zone 2; strength twice a week; add hard intervals only if well-conditioned.
- 60+: low-impact Zone 1–2 (walking, cycling, swimming), strength, balance and flexibility work.
🛒 The cheaper strap: Polar H9 Heart Rate Sensor
Same chest-strap accuracy for most training purposes at a noticeably lower price. The H10 adds internal memory and a second Bluetooth connection — features most people never use.
If you are buying your first strap, this is usually the sensible one. Neither strap makes training safer on its own.
Do you need tests before starting?
According to the American College of Sports Medicine (2015), healthy people without symptoms or known heart, metabolic or kidney disease can start light-to-moderate exercise and build up gradually without medical tests. Routine ECG, echo, stress tests or CT scans are not needed for low-risk people (USPSTF).
Get medical clearance first if you have:
- Heart disease, previous heart attack, heart failure, rhythm problems or valve disease
- Diabetes on insulin or sulfonylurea tablets (carry a quick sugar source), kidney disease, uncontrolled high BP, COPD or severe asthma, or a complicated pregnancy
- Symptoms: chest pain or pressure, unusual breathlessness, dizziness, fainting, palpitations, or unexplained leg swelling
Stop exercising and seek help immediately if you get chest pain, fainting or severe breathlessness during exercise. Call 112 or go to the nearest emergency department at once — do not wait to see whether it settles, and do not drive yourself.
Safety tips
- Warm up and cool down for 5–10 minutes.
- Increase time before intensity; raise weekly load gradually (about 10% a week).
- Don’t hold your breath while lifting weights.
- Hydrate, wear proper shoes, and avoid exercising in extreme heat.
- With high BP: favour Zone 2 and controlled lifting. With diabetes and nerve or eye damage: avoid very high-impact exercise.
- Pregnancy: use the talk test; avoid overheating, contact sports and lying flat on your back after the first trimester.
Key takeaways
- Use 208 − 0.7 × age (women: 206 − 0.88 × age) as a rough max HR.
- Spend most training time in Zone 2 — you can still talk.
- Aim for 150–300 minutes a week plus strength training.
- Most healthy people don’t need tests to start moderate exercise.
- Warning symptoms or chronic disease → medical clearance first.
Sources
- Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited, JACC (2001) — max HR ≈ 208 − 0.7 × age
- Gulati M et al. Heart rate response to exercise stress testing in asymptomatic women, Circulation (2010) — women: max HR ≈ 206 − 0.88 × age
- Riebe D et al. Updating ACSM’s recommendations for exercise preparticipation health screening, Med Sci Sports Exerc (2015) — who needs medical clearance before exercise
- WHO. Guidelines on physical activity and sedentary behaviour (2020) — 150–300 min moderate or 75–150 min vigorous per week + strength 2 days
- USPSTF. Screening for CVD risk with ECG (2018) — no routine ECG for low-risk people without symptoms
Medical disclaimer: This article is for education only and does not replace advice, diagnosis or treatment from your doctor. In an emergency, call 112. Read the full disclaimer.
Affiliate disclosure: This article may contain affiliate links. If you buy through them, I may earn a small commission at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. Learn more.
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