Zone 2 Endurance Base
Zone 2 Endurance Base follows Peter Attia's published approach: about 3 to 4 hours of zone 2 cardio a week across 3 to 4 sessions, plus roughly 20 percent VO2 max work. Zone 2 is the highest effort you can hold while keeping blood lactate under about 2 mmol/L, the pace where you can just maintain a conversation.
Attia's published approach is about 3 to 4 hours of zone 2 per week across 3 to 4 sessions of 45 to 60 minutes, plus a smaller dose of high-intensity VO2 max work. Zone 2 is the highest effort you can hold while keeping blood lactate under roughly 2 mmol/L (about 1.7 to 1.9 for trained people): the pace where you can just maintain a conversation. Roughly 80 percent of cardio lives here and about 20 percent goes to VO2 max intervals.
Why it works▼
Accumulate 3 to 4 hours of zone 2
Attia cites this as the minimum effective dose for an aerobic base.
Set the right intensity
Zone 2 sits just below the point where you net-accumulate lactate.
Measure lactate (advanced)
The most accurate way to confirm you are truly in zone 2.
Use the 80/20 split
A polarized model that builds both the aerobic base and the ceiling.
Add zone 5 intervals
VO2 max is one of the strongest predictors of all-cause mortality.
Ease in before settling
Lets heart rate and lactate stabilise so you train the right system.
Keep it year-round
An aerobic base is built over months and years, not weeks.
- Anyone building an endurance and longevity base
- People who sit most of the day
- Those training for the Centenarian Decathlon: capability at 90
- Attia is diagnostics-first and sells no supplement line; the few supplements he personally uses (omega-3, vitamin D, magnesium) he sources from Momentous and AG1. The equipment and lab tests here are generic recommendations ordered through a physician or lab, not his products
- VO2 max and other high-intensity work should be built up gradually; clear it with a doctor first if you have cardiac risk
- Zone 2 is meant to feel easy; going too hard defeats the purpose
- Educational only, not medical advice
- July 3, 2026 Protocol published.
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Not medical advice. This page is for education only and is not a substitute for professional medical care. Consult a qualified clinician before changing your health routine.
Independent curation. YourProtocol.ai is an independent platform. This protocol is based on the publicly available work of Peter Attia and is not created, reviewed, endorsed by, or affiliated with Peter Attia or Early Medical.