I injured my back last october. Took a few months of the bike to rest it and started XC again in december. I am OK sitting pedaling in the saddle unless it gets a real steep climb, but as soon as I come to a DH section and stand up my back kills me, it's just when I am stood up with my back slightly bent, typical DH position. I have been snowboarding and riding my moto trials bike without much problems. With race season approaching I am getting a bit worried now, as it does not seem to be getting better. Spoke to a doctor and he said it could take a year or more to improve. I have tried a foam roller, but not much help as the pain is really low in my back. Anyone experienced a similar injury and found a way to a quicker recovery?