Greenspan's eventual explanation for the growing gap between stock prices and actual productivity was that, fortuitously, the laws of nature had changed -- humanity had reached a happy stage of history where bullshit could be used as rocket fuel.
You have to have good training partners and not people who crank on things. There's a difference between cranking on it and catching it, holding it and making the guy work out. You have to be selective with your training partners for sure.