do a chin tuck and avoid slouching

I'm a little confused about chin tucks. I often hear people referring to them as ideal neck posture, and yet in McKenzie's book (where they come from), they're presented as a daily exercise, not a constant posture. The idea being that they help get you used to bringing the head back over the spine. The ideal posture being somewhat less extreme than a full tuck. And having watched Mew's video on chin tucking recently, I see that he also presents it as a daily exercise and not a constant posture. Which I hope is right, because the full tucks ruin the aesthetic of the face!

Yeah the chin tuck is a stretch you'd look stupid all day as natural posture. Make sure to keep your ears over your shoulders. That's a good place to start with the neck.