I was doing squats yesterday, started with 135 for 15,155 for 15,175 for 12 and when I went to 185, I got three. On my fourth rep at the bottom I had to push to get it up, as I felt lower back pain. I use good form and the weight as you can see was fairly light. I had done a killer back workout 3 days before this finishing with hypers and then light running by my house for about 3 miles. The day before yesterday, my back was very stiff from the back workout. I just started back into running for cardio, my leg muscles were not used to the running, so I went very slow. So basically I squated with a stiff back and my legs had some running stiffness in them as well (hip flexors). Has this happened to anyone? Did I pinch a nerve? I have lumbar pain today but I can walk, bend over to the front (not all the way). If I twist to the sides, it hurts. I am not asking for a diagnosis. Have you sprained, pinched, bruised , whatever you want to call it your lower back, and when did the pain go away. I know I should probably go see the doc, but for right now, ice and heat. Thanks