Man, I always seem to be tweaking my lower back when I do lifts for it. I don't know what I am doing wrong, as it isn't just with deadlifts, but goodmornings as well. I think my form is decent, most of the time I finish my set and just feel real nice and stiff/tight in the lower back, but yesterday (and this has happened a few times), I will finish the set feeling alright, and then a minute or so later a pain will develope that lingers and makes me fearful of doing any heavy full body work for the next week.

Is there anything I can look out for when doing lowerback sets to help prevent this? Should I never work my lower back to fatigue but always stop short? Is the tightness/stiffness I feel a good sign, or a sign that I was working it the wrong way and headed for injury? (I always just felt it was the lower backs' form of muscle fatige). I'm not sure, I just seem to do this frequently enough that I must be doing something wrong. :confused:

You need to be able to tell the difference between muscle fatigue and muscle pain. My lower back can get pretty tired and sore sometimes, but it's all due to muscle fatigue. If you feel actual pain, you need to check your form to make sure you aren't doing something improper before continuing along.

Sometimes a bout of intense back/ham/glute work can leave you "tight".

Try stretching after.

(1) While standing with feet together, keep legs straight and bend over at waist with hands on legs in the classic "bow to sensai" move.
Don't force it. Use hands to control stretch. Try to get torso to go lower while holding stretch.

(2) Sit on floor with legs splayed about 45 degrees. Bend forward at waist but keep back straight. Don't force it. Hold stretch. Try to keep legs flat on floor when Hams resist. keep feet pointing straight up.

There are others...