A muscle applies the most force or compression when it is under stress and not locked out, so a relaxed lock out position is better for the joints unless it is so relaxed that you are hyperextending. A lockout is a lower compression state.
That's my story and I'm sticking to it.
I'm confused by that, a relaxed lockout is still a lockout, isn't it? And, to be hyperextending would have to imply overly aggresive lockout not a relaxed lockout which would result in hypoextending as opposed to hyperextending, wouldn't it?