Which kind of place you’re walking into
Three very different things get called a gym in Japan, and the rules tighten as the price drops.
- Municipal sports centers (市民体育館 / 区民プール). The cheapest option by far — often a few hundred yen for a couple of hours, drop-in, no membership. Also the strictest: indoor shoes checked, caps enforced, tattoo rules posted, and a form to fill in on your first visit.
- Commercial clubs (Konami, Renaissance, Tipness, Megalos, Anytime Fitness). Membership-based, though many sell a day pass or a visitor rate. Same shoe and towel expectations, plus house rules on the wall in Japanese.
- Hotel gyms. The softest landing for a short trip. Shoes and training wear are often lent free, and there’s rarely anyone else in the room at 7am.
What to actually pack
Indoor shoes, a shoe bag, a face towel, a lock if the lockers take your own (most take a ¥100 coin that comes back), a drink with a lid, and — for the pool — a cap, plain swimsuit and goggles. Cotton t-shirts and jeans are refused at some clubs; ordinary sports clothing is fine everywhere.
Tattoos, honestly
The tattoo situation at gyms and pools mirrors the onsen one, minus some of the heat. Municipal pools and long-established clubs are the most likely to restrict visible tattoos; 24-hour chains and hotel gyms are the most relaxed. The usual middle ground is coverage — a rash guard in the pool, a sleeve or tape on the gym floor. It costs one phone call to find out, and finding out at the counter after you’ve changed is the version nobody enjoys.
Quick check
Three questions to test whether you’d get through a Japanese gym or pool without a staff correction.