HITT, or High Intensity Interval Training, is a growing fitness trend in the United States.  HITT is an exercise style that incorporates multiple short periods of high intensity exercise with periods of recovery in-between.  The periods of exercise and recovery each last from 5 seconds to 8 minutes.  Generally, a HIIT workout lasts between 20 and 60 minutes.  HITT can be performed using many different types of exercise.  For example, you can use HITT while cycling, running, walking, elliptical training, etc.  Although HIIT is an intense workout, it can be modified for all fitness levels, making it a workout style that