Question regarding stiff legged deadlift and good mornings. I noticed beginning last week and this week that when I attempt to do either of these exercises I get a lower back tightness. When I mean tight I mean you could bounce a quarter clear to the moon off of my lower back. When I reach back I can feel my lower back (in the kidney area) is very, very tight. Does not hurt when I squat, but does tighten up when doing SDL or the good mornings.