About
Built by the person who trains with it.
RepStack is a one-person product. The app, the progression engine, and every page on this site are made and maintained by Alex Tirim — a lifter who got tired of workout apps that log sets but never tell you what to do with them.
The app
A workout log that makes the next call.
RepStack is an iOS workout tracker. It logs every set offline, scores your strength across the five main barbell lifts, and runs a double-progression rule over your history to suggest the next session's weights and reps. The suggestions are coaching estimates computed from your logged sets — never a diagnosis, a recovery score, or a medical claim.
This site
Small on purpose.
The training guides here are written like a printed program with coach notes: one decision per page, the rule up front, a worked logbook example, sources next to the claims, and a section for when the rule fails. A guide that cannot offer something this site alone has — the app's actual rules, an original diagram, real log patterns — does not get published. The full bar a page has to clear is in the editorial standards.
Who writes it
One byline, no masthead.
Every page is written and maintained by Alex Tirim, founder of RepStack. There is no editorial team behind the byline and no claim of medical review — when an outside expert reviews a page, they are named on that page. The guides describe general training for healthy adults; pain, injury, and medical questions belong with a qualified professional, not a website.
Contact
Emails land in one inbox.
Questions, corrections, and support requests all go to [email protected]. Factual errors in any guide are corrected within 48 hours, with a visible note on the page. App questions are covered on the support page.