Zone 2 Heart Rate for a 40-Year-Old
A 40-year-old training in Zone 2 should target roughly 108–126 bpm, calculated as 60–70% of an estimated HRmax of 180. This is the aerobic-base zone where mitochondrial density, fat oxidation and stroke volume adapt most strongly — and the intensity you can hold in full conversation for 60–90 minutes.
Your Zone 2 Range
60% of 180 = 108 bpm. 70% of 180 = 126 bpm. Stay inside this band for easy aerobic development.
| Zone |
Name |
% HRmax |
BPM (age 40) |
| 1 | Recovery | 50–60% | 90–108 |
| 2 | Endurance | 60–70% | 108–126 |
| 3 | Aerobic | 70–80% | 126–144 |
| 4 | Threshold | 80–90% | 144–162 |
| 5 | Maximum | 90–100% | 162–180 |
Karvonen Adjustment (Personalised)
If you know your resting heart rate, Karvonen gives a more accurate Zone 2. Example for a 40-year-old with RHR 60: Zone 2 = 60 + (180 − 60) × (0.60 to 0.70) = 132–144 bpm.
Weekly Structure at Age 40
Most recreational athletes get the biggest return from 3–5 Zone 2 sessions of 45–75 minutes per week, plus one Zone 4 session for lactate-threshold stimulus. Sleep quality and recovery capacity become the limiter — not intensity.
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