First off, congratulations on thinking about this and wanting to make a change before it becomes a significant problem. I don't encounter too many patients who do that.

Yes, this is a matter of concern. Even if it's not bothering you much now, it will sometime especially if you participate in activities that require repetitive motions like cycling. Here are some links to stretches that are helpful:

http://www.easyvigour.net.nz/fitness...xorstretch.htm

http://www.easyvigour.net.nz/fitness/h_TFL_StrSt.htm

http://www.exrx.net/Stretches/HipExt...alRotator.html

http://www.drbackman.com/piriformis-muscle-stretch.htm

I usually have patients stretch each muscle group for 20 sec, 4 reps on each side at least once a day, preferrably twice if they are fighting an injury.

I also often recommend Pilates to clients.

Hope that helps.