QR codes for gym class schedules that change every session
Class times shift, instructors sub in, and the printed schedule on the wall can't keep up unless the code behind it can change too.
The problem with a printed schedule
Gyms reprint class schedules whenever a time slot moves, an instructor changes, or a new class launches. If the QR code on the wall poster is static, the poster is wrong the moment anything changes, even though the paper looks fine.
Point the poster at a link you control
Put a dynamic QR code on the printed schedule that forwards to a page you keep current, whether that's a booking app, a shared calendar, or a simple page you update yourself. The wall poster never needs reprinting again; only the destination changes.
Per-location codes
If you run more than one room or location, use a separate code for each so the front desk knows which room's schedule people are actually checking, based on scan counts.
Placement and size
Put it at eye level near the schedule board, sized around 3 to 5 cm since people usually check it while walking past. Add a short prompt like 'Scan for live class times' so it's clear the poster isn't the whole story.