Zone 2 Heart Rate Training Guide

Everything you need to know about Zone 2 heart rate training — the low-intensity zone (60–70% HRmax) that builds aerobic base, mitochondrial density, and long-term endurance.

Quick Answer: What is Zone 2 heart rate?

Zone 2 is 60–70% of your estimated maximum heart rate. For a 50-year-old man, the Tanaka estimate gives an HRmax of about 173 bpm, putting Zone 2 at roughly 104–121 bpm; for a 50-year-old woman the Gulati estimate gives about 162 bpm, or 97–113 bpm. At that intensity you can hold a full conversation in complete sentences.

Estimated Zone 2 (easy aerobic) at 60–70% of estimated maximum heart rate, by age. Men use Tanaka (208 − 0.7 × age); women use Gulati (206 − 0.88 × age). Values are population estimates, not measured maximums.
Age	Est. HRmax, men (Tanaka)	Zone 2 (easy aerobic) bpm, men	Est. HRmax, women (Gulati)	Zone 2 (easy aerobic) bpm, women
20	194	116–136	188	113–132
25	191	115–134	184	110–129
30	187	112–131	180	108–126
35	184	110–129	175	105–123
40	180	108–126	171	103–120
45	177	106–124	166	100–116
50	173	104–121	162	97–113
55	170	102–119	158	95–111
60	166	100–116	153	92–107
65	163	98–114	149	89–104
70	159	95–111	144	86–101

Why the men's and women's columns differ: the zone percentages are identical for both — 60–70% of HRmax is Zone 2 regardless of sex. Only the equation used to estimate HRmax differs: Tanaka (208 − 0.7 × age) is used for men and Gulati (206 − 0.88 × age), derived from a study of 5,437 women, is used for women. Because Gulati declines faster with age, the two estimates are close in the twenties and diverge by roughly 10 bpm by age 60. That gap reflects the study population each equation came from, not a different physiological zone model — and individual variation (±10–12 bpm) is larger than the difference between the formulas.

How to read these numbers: they are estimated maximum heart rates from age-based equations, not measured maximums. Individual HRmax varies by roughly ±10–12 bpm around any age prediction, so treat the bands as a starting range and adjust using perceived effort or a supervised maximum-effort test. Percent-of-HRmax zones are used here; Karvonen (heart-rate-reserve) zones are only shown once you enter a known resting heart rate.

Method: percentage of estimated HRmax. Formulas: Tanaka et al. 2001 (men), Gulati et al. 2010 (women). Last reviewed August 5, 2026. Educational information only — not medical advice.

Why Zone 2 Is the Foundation, Not the Filler

Iñigo San Millán, physiologist to Tour de France winner Tadej Pogačar, is closely associated with the emphasis on Zone 2 in professional endurance training. The rationale is that Zone 2 is sustainable long enough to accumulate large aerobic volume while fat oxidation is high, which is why it dominates most endurance training weeks.

San Millán and Brooks (2018, Sports Medicine) describe large differences in peak fat oxidation between trained and untrained individuals, with the highest rates seen in well-trained endurance athletes. The practical takeaway is that this capacity is trainable over years, not weeks.

Reference: San-Millán I, Brooks GA. Assessment of metabolic flexibility by means of measuring blood lactate, fat, and carbohydrate oxidation responses to exercise in professional endurance athletes and less-fit individuals. Sports Medicine. 2018;48(2):467–79.

How to Know You Are Actually in Zone 2

Nose-breathing test: if you can complete the session breathing only through your nose, you are almost certainly in Zone 2 or below.
Full-sentence talk test: you can hold a normal conversation in complete sentences. If you can only speak short phrases, you have drifted into Zone 3.
Lactate meter: a finger-prick reading of 1.5–2.0 mmol/L is the gold standard.
Heart rate ceiling: 60–70% of measured HRmax, or the top of your first ventilatory threshold if you have been tested.

How Much Zone 2 Is Enough?

World-class endurance athletes routinely accumulate 15–25 hours per week, most of it in Zone 2. For time-crunched recreational athletes the practical minimum for meaningful adaptation is around 3 × 45 min per week, ideally including one longer session of 60–90 min. Below that dose, mitochondrial adaptation is measurable but modest.

The Most Common Zone 2 Mistake

Almost everyone starts too hard. Real Zone 2 usually feels frustratingly easy for the first six weeks — pace on hills has to drop dramatically, and you may have to walk uphill to keep HR in range. Athletes who honour that discipline see substantial improvements in submaximal pace within 8–12 weeks. Athletes who drift into Zone 3 "because it feels productive" plateau.

What Each Zone Feels Like (Talk Test)

Zone 1 · Recovery: You can sing.
Zone 2 · Endurance: You can hold a full conversation.
Zone 3 · Aerobic: Speaking becomes noticeably harder.
Zone 4 · Threshold: Only short phrases of a few words.
Zone 5 · Maximum: Almost impossible to speak.

Heart Rate Zones (reference: age 30, HRmax ≈ 187 bpm, Tanaka)

Zone	Name	% HRmax	BPM (age 30)	Primary use
1	Recovery	50–60%	94–112	Warm-up, recovery, active rest
2	Endurance	60–70%	112–131	Aerobic base, fat oxidation
3	Aerobic	70–80%	131–150	Tempo, aerobic capacity
4	Threshold	80–90%	150–168	Lactate threshold intervals
5	Maximum	90–100%	168–187	VO₂ max, neuromuscular power

Disclaimer: This calculator is for informational purposes only and does not provide medical advice. Always consult with a healthcare professional before starting any new exercise program.

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