The book “The Power of Full Engagement” has the objective of teaching how to sustain high performance in the face of increasing demand. It describes energy, to be the fundamental currency of high performance. Every thought, feeling, and action has energy consequences and therefore argues energy is the most important resource in both an organization, and in our personal lives. Our energy capacity is described as one's ability to expend and recover energy, and high capacity is needed to sustain high performance. To build our capacity we must push beyond our normal limits, and then follow with intermittent energy renewals. But pushing too hard without intermittent renewals, or not enough, can actually decrease one's capacity.