I'm not advocating the strenuous life for everyone or trying to say it's the choice form of life. Anyone who's had the luck or misfortune to be an athlete has to keep his body in shape. The body and mind are closely coordinated. Fattening of the body can lead to fattening of the mind. I would be tempted to say that it can lead to fattening of the soul, but I don't know anything about the soul.
The choice of souls was in most cases based on their own experience of a previous life... Knowledge easily acquired is that which the enduing self had in an earlier life, so that it flows back easily.
The shift to a cleaner energy economy wont happen overnight, and it will require tough choices along the way. But the debate is settled. Climate change is a fact.