Hello again! STS Gym is something that is/may be in the works at some point in the future. It would be something you would put on an MP3 player and take to the gym where you could use gym equipment rather than what most people have at home. It will be quite far off though. I have read of some people loading the discs onto their ipods (depending on which model you have - not all have this capability) and taking it to the gym that way. Hope this helps! Shana