I recently read this article from HBR, and found this part very insightful:

In training athletes, we have never focused on their primary skills—how to hit a serve, swing a golf club, or shoot a basketball. Likewise, in business we don’t address primary competencies such as public speaking, negotiating, or analyzing a balance sheet. Our efforts aim instead to help executives build their capacity for what might be called supportive or secondary competencies, among them endurance, strength, flexibility, self-control, and focus. Increasing capacity at all levels allows athletes and executives alike to bring their talents and skills to full ignition and to sustain high performance over time—a condition we call the Ideal Performance State (IPS). Obviously, executives can perform successfully even if they smoke, drink and weigh too much, or lack emotional skills or a higher purpose for working. But they cannot perform to their full potential or without a cost over time—to themselves, to their families, and to the corporations for which they work. Put simply, the best long-term performers tap into positive energy at all levels of the performance pyramid.