That&#x27;s really surprising, if it&#x27;s true.<p>I&#x27;d like to see this one replicated before I start believing it.<p>I wonder whether it could be useful for other things. If I want to be a better public speaker or tennis player, can I spend five minutes visualising myself as a better public speaker or tennis player? (I wouldn&#x27;t be surprised if the answer is yes for the first since public speaking is so confidence-dependent, but what about the latter?)