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: Stephen Nachmanovitch is a musician, author, computer artist, and educator. He is an improvisational violinist, and writes and teaches about improvisation, creativity, and systems approaches in many fields of activity.