LEADERSHIP IS SELF-LEADERSHIP. Approaching sixty, Srini Maddineni was a successful global technology executive who believed a story he had told himself for decades: My body is fragile. I am not built to run. He had built systems for global companies, but he had never pressure-tested the system he lived inside. Then, he stepped onto a treadmill to run a single mile. Zero to 26.2 is not a standard memoir about sweating it out. It is an engineer’s logbook on reconstruction. Using data, technology, and rigorous self-inquiry, Maddineni documents the “architecture of agency”—how to rebuild a legacy system (the body) and upgrade the operating system (the mind). From the solitude of hotel gyms to the data streams of a Stryd foot pod, this is a book about the “Centaur”—the modern human who uses technology not to replace effort, but to amplify it. It is a testament that age is not a barrier, but a companion; and that the discipline we forge in the dark is the only thing that sustains us in the light.