Slow aerobic training is essential for mitochondrial development. The more slow runs you do the more mitochondria you develop 👍 BUT, WHY IS MITOCHONDRIAL DEVELOPMENT IMPORTANT ? Put very simply Mitochondria produce energy for cells. In the presence of oxygen, mitochondria breakdown carbohydrate, fat, and protein into usable energy. Therefore, the more mitochondria you have, and the greater their density, the more energy you can generate during exercise, and hopefully the faster you will be able