I have been getting some pretty severe back pain when climbing. I am not sure where everyone lives but I am in the bay area and typically climb hwy 9, Page Mill and Montebello. I am riding only 3 days a week so I am getting a lot of rest. I have been stretching. I have been training differently this year - doing intervals so I thought maybe it could be that I have been going up mountains before putting in some good solid miles on my bike. Other than my training, nothing has changed, same weight, same bike. Any advice regarding exercises, bike stuff, anything is greatly appreciated.

Christine