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Recently, there seems to be a lot of buzz going on about interval training being very beneficial to weight loss and body composition. As I am a huge proponent of interval training I find that most people have a general idea of what interval training is but do not know the correct way to perform intervals. Many people believe that if they just go balls out for a while than relax for a while they are performing an interval. A true interval should be done based on an individual's heart rate.