Dr Oz: Fast Exercise, High Intensity + Who is Dr Michael Mosley? NEXT PAGE ADVERTISEMENT Dr Oz: Fat-Burning Workout That Works Fast A controversial but popular book, The Fast Diet, made a splash in the health world. Its author, Dr Michael Mosley, visited Dr Oz to introduce his version of a healthy workout, Fast Exercise. Dr Oz: Who is Dr Michael Mosley? Dr Michael Mosley explained that short bursts of High Intensity Training are the secret key to his time-saving Fast Exercise plan to lose weight and be fit.