They correspond to the English initials of the new method of entrenamimento that is raging, whose translation is "High-intensity interval training". The system consists of alternating intervals of intensive work with other softer. The high intensity can be of thirty seconds about to give way to others of a minute and a half more "ligths". It is said that it burns fat up to 9 times more than training with conventional. As the intense work is very hard it is recommended to pass medical control previously to make it.
