Time management asks: 'How can I do more?' Energy management asks: 'How can I do what matters, sustainably?' In a world of infinite demands and finite resources, the winners won't be those who work the most hours. They'll be those who work with the most intention, recovery, and aligned energy. Research from the Harvard Business Review and Tony Schwartz's Energy Project reveals that humans operate in ultradian rhythms, 90-120 minute cycles of high and low alertness. A focused 90-minute deep work session often outperforms 4 hours of distracted multitasking. Energy management asks: 'When am I at my best?' not 'How long can I work?' High-performing leaders tend to manage energy across four key dimensions: 1. Physical Energy, 2. Mental Energy, 3. Emotional Energy, 4. Purpose Energy.