Trust me,,, screwing up your back is the WORST thing you could ever do. I used to laugh and make comments about people not taking them seriously when they said they had back problems,, not being rude or mean,, just never understood the "back problem" issues they had.
But after July of 2003 when I was hit head-on going 75 and the other going 80 on the interstate,, I now know what it is like to have back issues. $80,000 of therapy, $31,000 of medical visits,xrays,MRI's, and $15,000 of medicine,, I now understand exactly what they are complaining about.
Take heed Daniel Son,, protect that back at all costs,, because it is no fun riding a bike with back pain,, and there are alot of things you will miss doing when you can no longer do them.