I've had this ache in my lower back for about a week. I got it while teaching my four year old son to ride his bike without training wheels, which he can do now , however, my back's been bugging me, and yes, I've commuted via bike a few times this week too. Here's my stupid question. Do I have to take a break from riding until my back stops hurting? I'm hoping someone will honestly say that riding won't aggravate it any more. I really want to ride, because I just put on some new 165mm bulletproof cranks and I uped my chainring a couple teeth, but I haven't given it a test ride yet. What do you think? Is it safe for me to ride?