Thanks, hungryone. I'm not tall (5'10'' or 178cm). But I do have weak neck extension muscle due to bad posture. I guess because tall people usually look down so they tend to have poor posture? I was an average guy with tall guy's posture, trying to fix it for a long time but my head still unconsciously move forward when I do not focus on my posture.
I'll definitely try cuz it's an obvious weak point I've spotted but just never really paid attention to.