This might be of use to you guys, just want to dispel the myth of "anterior pelvic tilt". A lot of people make the mistake of "engaging the glutes" and trying to posterior rotate the pelvis, this is completely wrong. Our spine has a natural curvature and lordosis in the lumbar, you must stick your butt out and up to have proper posture. What people think is anterior pelvic tilt is most of the time not and it's actually swayback posture, the back looks excessively arched because of the mid back, not the lower back. And for people who do have "anterior pelvic tilt", their lumbar is completely fine, it's just they lean their upper back too far back and lack hip extension.
Read this if you guys want to know more.
There is no anterior pelvic tilt myth. It's a real condition and I had it clearly visible in my x-rays and side pictures from 2 years ago when I started treating it. Since then it has reduced by stretching hip flexors and lower back muscles and strengthening abdominal, hamstrings, and glute muscles. My lower back and knees pain and discomfort reduced as well.
my story: http://www.aljabri.com/blog/my-story/
http://www.apicareonline.com/common-low-back-pain-is-it-really-a-mystery/
"virtually all disc herniations protrude posteriorly or posterolaterally."
https://www.youtube.com/watch?v=yolNtwioYFE
Video above showing what he means
In the x ray, did you check the the lower back, in particular, L4-L5 and the L5-S1, to see which direction it was protruding? As mentioned above, most protrude posteriorly, this is caused by spinal flexion. You should really read the links I provided, Larsen explains it all. Like I said, most of the time, excessive arch comes from the mid-back (TL-junction, thoracic spine, thorax, whatever you want to call it). Read the link of the first post, read the section titled "“Anterior pelvic tilt”, a thoracic stability problem".
My comment is in reply to this part of your original post:
This might be of use to you guys, just want to dispel the myth of "anterior pelvic tilt". A lot of people make the mistake of "engaging the glutes" and trying to posterior rotate the pelvis, this is completely wrong...........
Anterior pelvic tilt is a real condition and exercising the glutes is a correct part of treating it.
my story: http://www.aljabri.com/blog/my-story/