The body is understood to bring energy to the system.  We eat a certain way, exercise and attempt to get enough sleep.  Howsever, we do not fully realize how much energy is dissipated through the type of thinking and emotional reactions that normally consume us. The more we observe our own minds, we realize not only how mechanical our thinking is, but also how much energy it takes to maintain our usual pre-occupations.  It is functional to use our thinking constructively; however, when unconscious reflection and cogitation expands from early childhood issues, the nervous system is affected by draining much needed psychological energy.  The way to retard this process is to learn different trainings which generate energy and not dissapate it.