I agree with you. But consider the capacity of a healthy individual, now spending 30 minutes or more, focused on a single task. Doing low intensity excercise without doing anything else...is an utter shite use of valuable time. It's just a waste of time that could be spent getting the heart rate higher, the muscles full of blood, etc.. I agree that it's beneficial but barely. Low intensity is good for getting people who don't workout to start lifting their arses a bit. But it has hardly any substantial effects on a healthy individual as compared to lifting or sprinting or jogging.