Daily Sweat lists 3 gyms in Réunion where you can train on a day pass, across 1 city. 3 sell passes at the front desk. Chains with walk-in passes include MYGYM 360 (3 branches).
Keeping it accurate: prices come from gym websites and travellers who checked in; each listing shows when it was last verified. Spot a change? Every gym page has “Suggest an edit”.