High-intensity interval training (HIIT) or sprint interval training is an exercise strategy that is intended to improve performance with short training sessions. HIIT is a form of cardio which is beneficial to burning fat in a short and intense workout. Usual HIIT sessions may vary from 15-30 minutes. Most HIIT sessions have a 2:1 ratio in terms of time. For example, for running, a HIIT session may be something as 60 seconds jog, 30 seconds sprint. n example of a HIIT session may be as...