From the “I am fat” thread. Looking for info on HIIT; experience, successes, types of workouts, what not to do, etc. I watched the video that was linked and found it fascinating. I have run on and off for 40 years. Have done a marathon, several half marathons, but last couple of years have not been doing much. Close to my all time high in weight (6 ft., 220), and ready to make some changes.