Well, my motto of "Go heavy or go home" didn't serve me so well today. It was back day and after warming up a bit, I started of my workout with rack pulls (partial deads). Warm-up sets with 135 and 225. Hit 315 for 12 reps. Pulled 405 for 6 reps. Loaded up the bar with 455, tightened down my belt, tightened up my wraps and gave a good tug. . . Instead of impressing those around me with my feats of strength, I felt a pop or twinge on the right hand side of my lower back.
That abruptly ended my back session and now my back is a bit tender, and hurts when I move certain ways. I think its probably justs a strain but I guess I'll wait a couple of days and see if it gets better. I'm iceing it now. Hopefully it isn't a slipped disk.
For reference, I attached a medical-ish diagram showing where the pain is.