You can also take a walk while meditating. Just clip that MP3 player to your belt or drop it into your shirt pocket as I do, and put in the ear-buds. I like to walk the woods or along a beach while listening to a brainwave entrainment recording. You might try it on city streets as well. In fact, the small size and almost meaningless weight of MP3 players has opened up many interesting ways to practice meditation using brainwave technologies.