I have noticed that I have some anterior pelvic tilt (both my backside and lower stomach poke out) and when I spend a few hours walking or standing, my lower back gets incredibly tight. As I start to progress on the lower body lifts, I am concerned that this lack of mobility could impair my (long term) progress on the big lower body lifts.
I have been following Jim Wendler's 531 for the last 9 months and I have seen some great gains in the big 4 lifts and would put myself firmly in the 'intermediate' category (BW Press, 1.5xBW Bench, 2xBW Squat, 2.5xBW DL). I live a fairly sedentary life style working mainly in an office, hunched over a computer for most of the day.
I wonder whether you (or anybody else) could offer some advice on a program that would fit into the 'Assistance' to help correct this imbalance? I would also be open to following a different to 531 if it offers long term improvements. Also, I know that this isn't the 531 forum, but different can be positive.
Thank you in advance for any and all advice.