I've been cycling for about a year seriously, and this winter during riding on the trainer, I have had constant lower back pain. Right in the middle of the lower back. It never hurts while I'm riding, it's always after, and the next day. And since I ride most everyday, the pain is every day. It feels like when you stand on your feet all day, and then you bend over to stretch, and the lower back hurts, but it feels good to bend over.

Is there a stretch I should be doing that would help this? Any thoughts appreciated.

Thanks