Cardio and running
Zone 2 Cardio: Heart Rate, Pace, Benefits and How Much
Published October 20, 2026
Zone 2 cardio is steady, easy endurance work, intense enough to breathe a bit harder but easy enough to hold a conversation, usually about 60-70% of your maximum heart rate. It builds your aerobic engine with little fatigue, which is why endurance athletes do the large majority of their training at low intensity.
How to find your zone 2
| Method | Zone 2 marker |
|---|---|
| Talk test | Full sentences, no gasping |
| Heart rate | ~60-70% of max heart rate (see heart rate zones) |
| Effort | 3-4 out of 10 |
| Breathing | Nasal breathing possible for most people |
Age-based max heart rate formulas can be off by 10+ beats for an individual. If your measured max is unknown, trust the talk test.
What the research says
- Successful endurance athletes spend most of their training time at low intensity, with a smaller share of hard sessions (Seiler, 2010).
- A "polarized" model (lots of easy, some very hard, little in between) improved key endurance variables more than threshold-focused or volume-only training in one study (Stöggl & Sperlich, 2014).
- Zone 2 corresponds to the intensity range where fat oxidation is high, which researchers use to assess metabolic fitness in athletes and less-fit people (San-Millán & Brooks, 2017).
Zone 2 by activity
| Activity | What zone 2 feels like |
|---|---|
| Running | Slower than you think, often 1-2 min/mile slower than 10K pace |
| Cycling | Steady spin, conversational |
| Incline walking | Brisk walk uphill, breathing deeper |
| Rowing | Steady strokes, nasal breathing |
| Elliptical / StairMaster | Constant moderate pace |
Beginners often need walk-run intervals to stay in zone 2; that is normal.
How much per week?
| Goal | Zone 2 per week |
|---|---|
| General health | 150-300 min of moderate activity (WHO guideline, Bull et al., 2020) |
| Recreational runner | 75-80% of total running time |
| Endurance event prep | 3-6+ hours, plus 1-2 hard sessions |
Sample week (runner, 4 days)
| Day | Session |
|---|---|
| Tue | 45 min zone 2 + 6 strides |
| Thu | Intervals: 6 × 3 min hard / 2 min easy |
| Sat | 40 min zone 2 |
| Sun | Long run 70-90 min zone 2 |
Plans: couch to 5K, 10K training plan.
Common mistakes
| Mistake | Fix |
|---|---|
| Every run "kind of hard" | Easy days easy, hard days hard |
| Chasing a faster friend's pace | Your own pace, walk the hills |
| Trusting 220 − age blindly | Talk test or measured max |
| Quitting because it feels too easy | Benefits build over weeks |
Zone 2 also pairs well with lifting: low fatigue means your strength sessions don't suffer. See VO2 max for the high-intensity side.