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Weekly · Sunday Morning

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Rapamycin extends mouse lifespan 9–14%
NAD+ precursors reverse aging in humans
Blue-light glasses improve sleep quality
Walking 10 min after meals blunts glucose
Verdict change — caffeine half-life downgraded

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How to Train Your Cardiovascular Fitness | Peter Attia — Whalespan

Content›Video›How to Train Your Cardiovasc…

How to Train Your Cardiovascular Fitness | Peter Attia

Peter Attia11m · 2025-10-31

Claims Made

21

Claims Supported

21

Support Rate

100%

Support rate

21 of 21 claims supported

21 supported0 partial / not

Claims from this content

17

✓Well SupportedThe intensity of a four-minute all-out interval should be such that significant discomfort is not felt within the first 30 seconds, indicating an appropriate pace.✓Well SupportedZone 2 sessions should ideally be at least 45 minutes long, as shorter intervals may not produce the same physiological effects as longer, steady-state efforts.✓Well SupportedZone 2 exercise is the intensity at which mitochondria produce the maximum amount of ATP under purely aerobic conditions, primarily by recruiting type 1 muscle fibers.✓Well SupportedZone 2 training is best measured by lactate levels or, at a minimum, Rate of Perceived Exertion (RPE), as heart rate is a less accurate approximation.

More from Peter Attia

Peter Attia on Zone 2 Cardio

Peter Attia on Rapamycin (with Matt Kaeberlein)

Attia walks back the clinic protocol: too aggressive for healthy adults

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A. Volkovreader

4h

Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.

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Would love a "what would change this verdict" RSS feed. Sign me up if it exists.

✓Well Supported

Zone 2 training can be effectively performed on treadmills, rowing machines, and swimming.

✓Well SupportedThe training volume rule of thumb for cardiorespiratory fitness is approximately 80% in Zone 2 and 20% in V02 max.

✓Well SupportedPeter Attia structures his cardio week with Zone 2 training on Tuesdays, Thursdays, and Saturdays, and VO2 max training on Sundays, preceded by Zone 2.

✓Well SupportedApproximately 80% of training volume should be Zone 2, with 20% dedicated to higher intensity work.

◐Partially SupportedPeter Attia's heart rate reaches within two beats of his maximum heart rate at the end of his one-minute near VO2 max efforts during HIIT.

◐Partially SupportedVO2 max training is effectively performed on hills, involving hard effort going up and easy effort going down.

◐Partially SupportedVO2 max training can be performed using air bikes, regular bikes, stationary bikes, stair climbers, treadmills, running outdoors, and rowing machines, provided the intensity is sufficient for 3-8 minute intervals.

◐Partially SupportedPeter Attia's coach sometimes required 2,000 kilojoules of work at Zone 1-2 intensity before a VO2 Max set on big training days.

◐Partially SupportedIn a four-minute high-intensity interval, the work performed in the first half should not exceed the work performed in the second half by more than approximately 10%.

◐Partially SupportedBrisk walking is a sufficient starting point for exercise for beginners.

◐Partially SupportedElite cyclists dedicate 80-90% of their training to Zone 2.

◐Partially SupportedPeter Attia dedicates four to five hours per week to dedicated cardio, excluding rucking.

◐Partially SupportedTo effectively complete a four-minute high-intensity interval, one should aim to average a specific wattage, starting at approximately 105% of that target wattage for the first minute.