I have a weak lower back. Twinged it once years ago doing squats and now I have to be careful. Sometimes I will go weeks and weeks without any problems then something as simple as bending down over the sink to clean my teeth will set it off. Always on the left side and always a pain like a trapped nerve. Can screw my training up for days and days.

The only hing I have found it to just be careful. Dont do too much that will effect it, i.e digging, awkward lifting and deadlifts.