How much Zone 2 training should you do each week?
There is no single magic number, but two strong reference points help: public health guidelines for general fitness, and how endurance athletes split their training between easy and hard work.
For general health: the WHO guidelines
The World Health Organization's 2020 guidelines recommend that adults aged 18–64 do at least 150–300 minutes of moderate-intensity aerobic activity per week, or 75–150 minutes of vigorous activity, or a mix — plus muscle-strengthening activities on at least two days. Adults 65 and over should do the same, plus balance and strength activities on three or more days a week. Going beyond 300 minutes of moderate activity can bring additional benefits.
Zone 2 training counts as moderate-intensity aerobic activity, so 150–300 minutes a week of Zone 2 meets the aerobic part of the guidelines.
For endurance performance: the 80/20 pattern
A review of well-trained and elite endurance athletes found they typically do around 80% of their training at low intensity, with the rest at or above threshold. In the preparation phase, rowers, cyclists, runners and cross-country skiers spent roughly 84–95% of their time in the lowest zone. A "polarised" distribution — about 75–80% easy, a little threshold work and 15–20% high intensity — has produced good results in several studies, although the authors note the evidence is mostly short-term and varies by sport.
Sample weekly plans
| Goal | Zone 2 per week | Other training |
|---|---|---|
| Starting out | 90–150 min (e.g. 30 min × 3–5) | 2 days of strength work |
| Meet health guidelines | 150–300 min | 2 days strength; optional short faster efforts |
| Recreational endurance | 3–5 hours | 1–2 harder sessions; 2 strength sessions |
| Competitive endurance | 6+ hours (≈80% of total) | Structured intervals as ~20% |
General examples, not individual prescriptions. Build up gradually — a common rule of thumb is not to increase weekly volume by more than about 10% at a time.
Session length
Any amount counts towards activity guidelines. For aerobic adaptation, many coaches favour sessions of 45–90 minutes once you can manage them comfortably. If time is short, several 30-minute sessions are better than one occasional long one.
Keep easy days easy
The most common mistake is drifting into Zone 3 — "moderately hard" — on every session. It feels productive but builds fatigue without the benefits of truly easy or truly hard work. Use your Zone 2 range and the talk test to stay honest.
Frequently asked questions
Is more Zone 2 always better?
Up to a point. The WHO notes benefits beyond 300 minutes a week of moderate activity, but more time needs more recovery and is not always practical. Consistency matters more than volume.
Should I do all my training in Zone 2?
For general health and beginners, mostly easy training is fine, with strength work twice a week. For performance, most evidence supports mainly easy training plus some harder sessions.
Does walking count as Zone 2?
If it raises your heart rate into your Zone 2 range or makes you breathe deeper while still able to talk, yes. Brisk or uphill walking often does for beginners.
Medical note: This is general information, not medical advice. Heart rate formulas are estimates. If you have a heart condition, high blood pressure, diabetes, take medication that affects heart rate (such as beta-blockers), are pregnant, or are new to exercise, ask a doctor before changing your training. Stop and seek help if you feel chest pain, severe breathlessness, dizziness or palpitations. Full disclaimer.
Calculate your Zone 2 heart rate