<human>:  What is the difference between HIIT and HIIT?
<bot>: HIIT is High Intensity Interval Training. HIIT is a brand of HIIT. High Intensity Interval Training is a type of exercise that alternates between periods of high intensity exercise and periods of rest. HIIT is often used in a training program to improve aerobic fitness and anaerobic performance. HIIT can be done in many ways, including jogging, cycling, swimming, and weightlifting.