HIIT High-Intensity Interval Training
High Intensity Interval Training (HIIT) is a training system of organizing training, which includes repeated bouts of short duration.
High intensity exercise of HIIT could be considered as anything over level 7, out of a 1-10 scale of perceived exertion.
By using max heart rate (MHR) as a guide, high intensity exercise of HIIT could be considered as anything above 80% of MHR.
HIIT is one of the most efficient training system to strengthen body quality.