HIIT is an acronym meaning High Intensity Interval Training. Many fitness professionals, workout DVDs, and fitness studios have made a name for themselves promoting this style of workout. The big benefit is that you can get a hard workout, and fitness improvements, in a shorter period of time. The problem is that the workout style has been so highly promoted many individuals are over doing it. If done correctly HIIT workouts are very high intensity short duration workouts. If you do this type of workout too frequently or for longer periods of time you are at an increased risk of injury or burnout. Plus you will likely not be able to continue putting in the correct intensity.
It is recommended to only do HIIT workouts 1 to 3 days per week, alternating with more moderate workouts. Also, if you are new to working out, or have injuries or health issues, you likely need to skip HIIT completely. First improve your baseline fitness. Then you will be able to gradually add more variety to your workouts. Be sure to master a specific exercise before including it in your HIIT workout.
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