Then use the Nano at the gym for now, that's what I do. It's controls are better suited than the Touch so you can pause it, change tracks, etc while it's in your pocket. Plus it's smaller and supports the Nike Plus accessory which the Touch does not.
I wanted to use my Touch in the gym, but until there are good cases and a remote available, it stays home and the nano comes to the gym.
One thing I was hoping for was streaming music via wifi, but since you can't do that anyway, it's not big deal.