I started Rippetoe's Starting Strength a little longer than two months ago. Lately I've been noticing some lower back pain, just to the left of my tail bone. I don't get any pain when I'm in the gym, but it's usually when I'm sitting in my chair at work or at home that I notice it. I actually feel great after I'm done doing my squats.
I've tried very hard to concentrate on good form, as well as doing warm up sets, especially with squats. I don't feel any strain until my working sets of 5 reps, and then I feel like I'm using my lower back a bit at the very end of my lift.
I'm just wondering if doing squats with such heavy reps at three times a week is too much? It's funny, though, the other night I told myself that I would take a break from squats to rest. I still ended up in the rack though, albeit with less weight than normal.