I read somewhere that you have to be careful in the gym when returning weights. Example; a couple of lazy- butts left plates and dumbbells all over the floor where I wanted to lift. Without a warmup and fresh as a daisy, I angrily started to quickly put back the iron in its proper place. As I swung a 60 pound dumbbell back to the rack......pop went the lower back. Yes, it was stupid, I know and I should have remembered that article I read about being careful when putting equipment away and even when loading a barbell with big plates.
I'm doing ice and heat for the back at the moment. I'll keep you posted. If you have any ideas on recovery let me know.