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Even Shorter Bouts of High-Intensity Exercise Improve Physical Fitness in Inactive Men

May 29, 2013 — It is a commonly held perception that getting in shape and staying there requires hard work and hours upon hours of training. Now, new research from the Norwegian University of Science and Technology (NTNU) shows the opposite -- just four minutes of vigorous activity three times per week is enough to make previously inactive men fitter and more healthy.