High Intensity Interval Training:
Boot camp classes to Crossfit have made this concept more popular. Any time you increase your intensity with exercise you get the benefits of increased metabolism. With this you are guaranteed to burn a lot of calories during and post exercise. Athletes all over the world are used to a workout system like this because they are forced to push their bodies past the point of breaking down. But for the average person this can be a delicate dance with "Injury".
Negatives of H.I.I.T:
What is your goal with your exercise program? How often do you perform the H.I.I.T programs? If you are not sure about both of these questions, you will for sure run into trouble during your workouts. Either Plataues or Injuries will arise. Just like everything in life, Balance is crucial to create Homeostasis. If you person H.I.I.T workouts all the time, your body will wear out.
H.I.I.T Done Right:
There is a reason why every Athlete from Amature to Elite have Coaches. Coaches allow you to look from outside the box allowing the workouts to be specific and geared towards Short Term Goals and Long Term Goals. Here is an example of creating a workout specific to your Goals: