High Intensity Interval Training is the same as Interval training, just at a higher intensity leve (oddly enough). The work periods are longer and harder, and the rest periods are shorter. The result is an even bigger oxygen debt created, meaning that even in the rest periods the body is still working hard to remove lactate from the body.

HIIT is so intense that sessions usually only last around 15 minutes. Any longer would be almost impossible to maintain at a high enough intensity level. Anyone thinking of trying HIIT would have to have already trained using Interval training to have anywhere near the required cardiovascular capability to make the method worthwhile.

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