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.
Accumulate 3 to 4 hours of zone 2 3 to 4 sessions of 45 to 60 min per week; beginners can start at 20 to 30 min and build
Attia cites this as the minimum effective dose for an aerobic base.
Set the right intensity Highest effort where you can still hold a conversation (nasal-breathing borderline), heart rate steady
Zone 2 sits just below the point where you net-accumulate lactate.
Measure lactate (advanced) Finger-stick lactate around 1.8 to 1.9 mmol/L, taken after about 10+ min steady
The most accurate way to confirm you are truly in zone 2.
Use the 80/20 split About 80 percent of cardio time in zone 2, about 20 percent in VO2 max work
A polarized model that builds both the aerobic base and the ceiling.
Add zone 5 intervals Around 1x per week, intervals of 3 to 8 min hard with roughly equal recovery (for example 4 x 4 min)
VO2 max is one of the strongest predictors of all-cause mortality.
Ease in before settling 5 to 10 min easy, then hold zone 2
Lets heart rate and lactate stabilise so you train the right system.
Keep it year-round Spread sessions across the week; once a week loses fitness over time
An aerobic base is built over months and years, not weeks.
This protocol works from your actual levels. Testing partner coming soon.
- Chest-strap heart-rate monitor
We may earn a referral fee if you book testing through a future partner link; it will never affect which tests are listed here. This is not medical advice or a diagnosis.
Zone 2 builds mitochondrial density and metabolic flexibility (efficient fat burning), which underpins endurance and, in Attia's framing, the Centenarian Decathlon of staying physically capable late in life.
View sources
The Drive, AMA #19: Deep dive on Zone 2 training (Peter Attia)
Zone 2 training: foundations, finding your zone, programming and progression (Peter Attia topic guide, updated 2025)
Peter Attia: all things VO2 max (and the Zone 2 / VO2 max split)
The almost unbelievable effects of a high VO2 max on all-cause mortality (Peter Attia, 2024)
Association of Cardiorespiratory Fitness With Long-Term Mortality (Mandsager et al.)
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 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.
Is this for you
- Anyone building an endurance and longevity base
- People who sit most of the day
- Those training for the Centenarian Decathlon: capability at 90
Cautions
- 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
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