Brad has been refusing cardio since 2018. He read a forum post about the interference effect, didn't read the dose nuance, and made it part of his identity. His resting heart rate is 80+. He's winded climbing two flights of stairs at 34. He still tells the gym he doesn't do cardio because "cardio kills gains." The headline has cost him eight years of cardiorespiratory fitness.
Volume 18 of The Sequeira Library — Cardio 101: Conditioning Without the Confusion — is the volume that closes that particular argument with citations.
Inside this one
- Not medical advice.
- Personas in the volume are composite illustrations, not specific individuals.
- For pregnancy, chronic conditions, or clinical questions, see a qualified clinician.
The standard it is held to
Every factual claim in this volume names its source, and every claim carries a confidence grade — settled, strong, emerging or contested. Where the evidence is thin, the text says so. How it’s made, in full → · What we’ve got wrong →