Sorry for bothering you again. In that book, I continue to meet a paragraph which is hard for me to understand. What do the highlighted words mean in the following context?
To “be” confident, straighten your back, which is easiest to do by balancing your head properly on the spine first. Interestingly, feelings of pride tend to emerge after you assume this physical stance, even though you have accomplished nothing, because feelings originate inside your body, not from the outside world.
With proper posture, you will already be standing taller than otherwise but you should plant your feet firmly on the ground as well, at roughly shoulder-width apart. This will allow you to assume an unyielding and balanced stance, which matches the unyielding personality of a man
What does "proper posture" mean here? Does it mean "your posture when you are confident"? and "you will already be standing taller than otherwise" mean "you will already be standing taller than when you don't have proper posture", right? And does word "but" (after "than otherwise") has a special meaning or has any relation to "otherwise"? I've searched on Google many times but I don't believe in my opinion. Thank for your help!