There is a Michael Mosley BBC documentary "BBC Horizon: The Truth About Exercise" in which they find you can get most of the health benefits of aerobic exercise

There is a Michael Mosley BBC documentary "BBC Horizon: The Truth About Exercise" in which they find you can get most of the health benefits of aerobic exercise in about 3-10 minutes of HIIT exercise, high intensity here being going completely flat out (absolutely maximum effort!) for three 20 second burst with rest to catch your breath in between. The summary is here https://www.youtube.com/watch?v=iEc7QFc5vIQ https://www.youtube.com/watch?v=iEc7QFc5vIQ I cant locate the full Doc online right now.