Hi Shellyj. Um, sorry, but have to ask - is it just your butt that's getting bigger or is any other part of your body (or all of it) getting larger too?

I've never really noticed my butt getting noticably bigger.... but I do find track bike work does add to it a little (more muscle!) - and that's got a lot to do with the type of training for track - often hard, fast, intense.

If I'm just doing miles on the road bike, or even race training, my body just gets toned all over with no real change in size anywhere (that I know of....).

What type of riding are you doing to get a larger butt? Easy miles, hills, sprints etc?