Who's writing, and what he isn't.
Nelson Sequeira is a certified fitness professional with more than fifteen years of industry experience across Portugal, Bahrain, and the UAE.
He is not a doctor. Not a nutritionist. Not a physiotherapist. Not a psychologist. You'll see that sentence at the bottom of every page here, and it isn't legal throat-clearing — it's the point. A trainer who pretends to be a clinician is how people get hurt, and the fitness industry is full of them.
What fifteen years does buy is a very good sense of which claims fall apart when you look them up. This Library is what happened when someone finally looked them all up.
The standard, stated plainly.
Every factual claim carries a citation, drawn in this order of preference: systematic reviews and meta-analyses, then randomised controlled trials, then cohort studies, then position stands from bodies like the ACSM, NSCA, ISSN, WHO, and ACOG.
Every claim carries a confidence rating. Settled science, strong evidence, emerging, or contested. When experts disagree, you're shown the disagreement rather than the side that makes the better paragraph.
Every opinion is labelled as an opinion, and every anecdote as an anecdote. Fifteen years of watching people train is worth something. It is not worth a meta-analysis, and it will never be dressed up as one.
Nothing is exaggerated to sell it. There is a list of words this Library will not print — the ones the supplement aisle depends on. If a claim needs that vocabulary to sound impressive, the claim isn't impressive.
If evidence is mixed, say so. If a claim is contested, show both sides. Never present a contested claim as settled.
Written by a human. Narrated by a machine.
Nelson writes the Library. Research assistance and production tooling are AI-assisted — that's how one person ships a catalogue this size — but a human decides what it says, and a human is accountable for every claim in it.
The audiobooks are narrated by an AI voice. That's disclosed on every product, every video, and here. It isn't Nelson's voice, and it isn't pretending to be. Nobody is being fooled, which is a low bar the rest of this industry keeps limbo-dancing under.