A song that you listen to whilst working out, a song that gets you pumped up for/in the gym and one that you always listen to whilst 'pumping iron'!
The gym jam is also the song used my athletes to focus before a game or event.
Chase: Hey, what song you listening to?
Ash: Footloose from the movie of the same name!
Chase: Yeah booooi, thats one of my gym jams, whooop