[evex]

Hm, this tail out thing is very controversial, I've heard physiotherapists say you should tuck your pelvis.

actually there is this postural issue called APT(short for anterior pelvic tilt), it looks the same as "tail out", and people are getting a lot of lower back pain out of it.

not sure if APT is exaggerated 'tails out' or it is the actual 'tails out'.

Have you asked any physiotherapist about this 'tails out' approach?

[nverba]

No, this is purely anecdotal. I found that it helped when sat up straight and adjusted my hips. But, pushing out too far does put a different pressure on your lower back, and I agree, is just as bad. I think it's about getting the right alignment for the best support for your whole back.