Show this to an owner
Type the gym's name, show them the code. They scan it, land on a two-field form with the name already filled in, and it enters the same nightly check as every other listing. No account needed on either side.
whatgymscost.com/add-a-gym/
Open it here instead →Why this instead of asking for a number
Nothing to type on their side, no account, no app. The code just opens a normal web page — the same one at /add-a-gym/ that anyone can already reach without a code at all.
Printing a card instead? This page prints cleanly — the code and the plain address are all that's on it, nothing else.