The only link I can think of between physical strength and lucidity is that you feel stronger and believe more in yourself. If in real life you can lift something very heavy, if you try to lift it in a LD, you will probably be able to do it. If you can't do it in real life, it might be harder because you don't believe you can. However, physical strength is definitely not something needed for high quality lucids. Lucid dreaming is something anyone can do despite physical appearance.

Quote Originally Posted by ParanoidLlama View Post
As for special physical spaces, it could have been the belief that it'd increase vividness that had been planted into you on a subconscious level, because someone else in the dream told you that you'd have high vividness there.
I agree with Paranoid Llama on this. If you believe that you will have higher lucidity in one place than another, then you will. I don't believe that there are set places in the dream world that automatically give you higher lucidity. You need to work for it yourself.

These are just my thoughts. It's an interesting question.