Everyone confesses in the abstract that exertion which brings out all the powers of body and mind is the best thing for us all; but practically most people do all they can to get rid of it, and as a general rule nobody does much more than circumstances drive them to do.
Bio: Jed McCaleb is the CTO and cofounder of Stellar.org, where he leads technical development. Jed created eDonkey, one of the largest file-sharing networks of its time, as well as Mt. Gox, the first Bitcoin exchange.