lower back underdeveloped

[boldwarrior]

@sonicboom

took a bit of a vacation. Happy to all that this applies to.
If I were to see a PT how would I describe this problem or help guide their assessment of my issue. Its quite interesting that you bring up hip flexors. I have begun having some serious locking up in my right hip flexor. Not certain if this has anything to do with anything at all.

A good PT will find out anyway.
Ask for a Postural assessment from a PT who performs them regularly (ask around for PT)
He should then be able to find out the cause and help fix the issue through Exercise and maybe some Foam rolling.