Conventional racing no, triathlons yes. All that's keeping me from trying cross is a suitable bike.

But I'm far from serious. A few triathlons a season. I've got kids and the wife works some evenings and weekends so I *have* to use my commute as training. I'll just get up early to add additional miles or take a longer way home. I'll get in some group rides when I can.

Most of my group rides start at a bike shop that caters to commuters. One of their shops is located on a bikeway. Several people that do the group rides race too, and most if not all of them commute. Some of them practically live on their bikes so I don't think they see their commutes as training.