Every second, trillions of microscopic engines inside your cells are converting food and oxygen into usable energy. At the heart of this lies the Electron Transport Chain (ETC), a molecular conveyor belt that builds up pressure to spin a tiny turbine, creating the ATP that powers almost everything you do. When this system runs smoothly, you feel energised, resilient, and youthful. But when it falters, energy drops, inflammation rises, and aging accelerates. In this post, I take you under the hood of the mitochondria, exploring how the ETC works, and how tools like light and targeted nutrients can help keep your cellular engines running at their best.