Who is behind it and how we work.

Welfitlab is created and maintained by Sergio Gualda Rodriguez, a product designer. It is not a clinic or a sports centre, and no brand sponsors it.

The method and the plans rest on public recommendations and peer-reviewed studies: the World Health Organization's physical activity guidelines, the American College of Sports Medicine's position stands, and meta-analyses on habits, strength, steps and protein.

Every guide article links its sources. When a figure comes from observational studies, we say so, because they show association rather than certain cause.

The content has not been written or reviewed by a healthcare professional, and it does not replace your doctor, a physiotherapist, a nutritionist or a trainer. The app's numbers are general estimates for healthy adults.

If you have a health condition, are pregnant or something hurts when you move, talk to a professional first.

There is no advertising and no selling of data. What you log is stored in the European Union, and you can export or delete it whenever you like. The details are in the privacy policy.

If you spot a mistake or have a question, write to sergio@sgualda.com. We fix what is wrong.