Should you train for 60 minutes, 45 minutes or 30 minutes when you visit the gym? The answer really will depend on what you are training for. Why are the majority of personal training sessions 1 hour in length? This can often be fiercely debated but did you know that many many years before fitness centres and health clubs became popular Eastern Europeans discovered that as little as 10 minutes per day of certain exercise routines were extremely effective to changing the shape of their bodies. In 1996 an Exercise Scientist by the name of Izumi Tabata discoverd a 4 minute exercise method of that showed an incredible metabolic effect for such a short time. How long will you exercise for today?