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Originally Posted by babyblue_bunny87
What are some examples of HIIT (high intensity interval training). Is it alternating short spurts of high intensity cardio and strength training? Or something else entirely? 
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HIIT is used by fitter people and is only a matter of alternating between very high cardio (100%) effort and 85% effort or below, for a certain period of time, normally 20 minutes.
Alternating between cardio and weights is called circuit training.