When I run/jog my lower back begins to hurt after a couple of minutes. This lower back pain however does not occur when I do sprint work. I have a strong lower back (my hyperextension, deadlift, power clean weights are all good)
So I guess I have to questions why does my lower back get sore when I run jog but not when I sprint? My initial thoughts were that it would probably be worse when sprinting!
Why would it get sore at all if my lower back strength and posture are ok??
Im not fat or anything probably around 10% BF