I'm on w4r2 and am feeling pain in my lower back, around the top of my pelvis and into my hips. I'm not sure if I have trapped a nerve or if I have done this from running. If from running I am not sure how as nothing happened on my run to hurt. Could it be because I have been so unfit and now building up the muscels or could it be sinister? Has anyone got any ideas? My next run is due Monday, so have a couple of days to rest. Just worried I'm doing something wrong and don't want to injure myself or stop running. Cheers.