Hi Njkx,
I have nearly stopped my back huting when I ride at the local Motox practice track by-
a, making sure my kidney belt is in the proper place
b, doing this lower back exercise (olympic bar with 10kg each end, bend legs slightly, bend at waist (like you are going to touch your toes), pick up weight, lift weight until you are standing upright, bend down untill weight is 1inch from ground, lift till standing up..., do three sets of ten lifts, do this once a week, keep knees slightly bent throughout!)
c, spent two months in a pilaties class with 20 middle aged women (Im 30 so some looked quite good to me!) building up my core mussles (did this last year) This felt like it was doing nothing for me but my permanently sore back cured itself after the first lesson.
d, losing 1 stone of fat
e, standing taller on the bike (knees less bent) this was helped by...
f, slightly higher handlebars
all have helped especialy c and e. Be careful when doing exercise as described in c, if you do it wrong you can do a lot more damage than good but this exercise has really helped me, make sure the weight is light and you do the exercise slowly, I could lift a heavier weight but I would not gain anything, I do not do the exercise if my back is allready sore. Doing d, losing a stone of fat, is hard, I lost my appetite when I was seperating with my girlfriend of seven years, so there you go, you know what to do now!
Corndog