Actually, when you have a lucid dream where you are in the action of practicing for a sport or mental activity, you can train yourself to get accustomed to it. I just recently finished the book ETWOLD by Stephen Laberge and there was a very interesting chapter on how neural transmissions during dreams resemble those of waking life. So let's say I just learned a new move in free running/parkour (maybe a new flip). I can practice this in a lucid dream and try to get my neural impulses to get me accustomed to this new move. Really fascinating to see how it relates to waking life! So yes, this all the more reason to control our dreams