Conversely, most mental activities also rely on the physical dimension. Chess, for instance, is one of the most cerebral games there is; yet advanced chess players train by running and swimming because they are aware that if they are physically unfit they will not be able to sustain the long periods of mental concentration that chess tournaments require. In Yoga, the control of consciousness is prepared for by learning to control bodily processes, and the former blends seamlessly into the latter.
