What exactly is hiit cardio?

Question

What exactly is hiit cardio?

Answer 1

well lets see. hiit cardio is a type of cardio that burns much more calories in less time. well its like this. say your running on a treadmill and your running on a moderate pace were its like a piece of cake for you for like  30 seconds and after you raise the speed were your running at a speed that you could bearly withstand for 30 seconds. you could do this for like  20 minutes non stop.  30 seconds moderate and 15 to 30 seconds fast as you can.

Answer 2

what exactly is google?