Some gyms have lockers with a built-in combination dial, but others require that guests supply their own lock. Dealing with a small gym-lock key can be a minor frustration during a workout, but not if you have this simple — and inexpensive — solution.
Start off by purchasing the smallest dog or cat collar you can find; choose one that has a plastic fastener rather than one that looks like a belt. Attach a small key ring to your key and attach that to the metal ring on the collar. Wear it on your wrist or ankle while in the pool or during a cardio class, or clip it to the machine while going for a run or bike ride. If your gym also requires an ID, you can clip that on the collar as well. Worried about it getting lost? Order one of these collars that you can personalize with your name and number, and you're good to go.