The biology of high intensity interval training (HIIT): why it’s better than aerobic or cardio exercise for health and fitness

  So many people are interested in doing exercise or changing their fitness, and there seem to be so many different ideas around. It can be tricky to know which one to believe. At the same time, the scientific studies might be a bit much to attempt to dig into. This article aims to provide the middle ground: a summary of, and introduction to the biological process that happen during exercise, which are responsible for