A friend of mine thinks the spine should either be very slightly curved or not curved at all with a good posture. He showed me military posture which seems to show that’s the case, however all the “normal” posture things I’ve seen show the spine is more naturally curved.
So my question is the military posture the correct one and should our spines be mostly straight or no? If not any evidence for this so I can show them?
Can’t edit the post, but my friend also thinks that’s why car seats are straight and if our spines have a curve there’s something wrong.