Body The denser your mitochondria (the power plants of your cells), the healthier you are going to be, the better you are going to feel, and the longer you are going to live potentially. Research in exercise science shows that the best way to build mitochondria and maintain it from an exercise standpoint is to do brief, intense exercise periods followed by long rest periods. After a warm-up, I will jump on the cool, retro, Schwinn Airdyne bike and go all out for 30 seconds h