Hi. I am new to Starting Strength and lifting in general. I'm getting the book for Christmas but in the meantime I have been relying on Mark's videos for advice with my form. Now I saw a video where he is instructing a guy on how to drive up with his hips as if the bar was resting on his lower back. He says that the angle of your back might change a little but that's okay. Well I tried it out and as I was driving up with my hips my upper body tilted forward slightly and I felt like my lower back was doing a lot of work. I am not used to low bar squats I have just recently transitioned from doing high bar squats and I never felt much lower back involvement when doing high bar. So my question is, am I supposed to feel it in my lower back? Or am I doing something wrong that will fuck up my spine. As I'm typing this I realize I should have probably taken a video.