HIIT and the Truth:

More on HIIT:
The best bodyweight burner/HIIT Program

The aim of HIIT is to involve as anaerobic energy production systems.
In the hours after training you remain accelerated metabolism consuming extra calories.
  Ultimately, adding calories expended in the training session, the consumed by metabolism in the hours of recovery, managed to burn a lot more calories than in a continuous cardiovascular training 1 hour, for example running.
The key to the HIIT training is effective is the intensity and involving enough muscle for the metabolic impact is adequate (do not work with barbell biceps for 20 "at full speed). An exercise bike, running, swimming, or exercises like squats or burpees are perfect for HIIT training.


The intensity and speed of execution that requires this training method are quite high. If you have a good physical condition you could go wrong and do not even get to complete it. "
 
On the other hand, you need to muscle control and to conduct joint exercises at high speed. The risk of injury especially for people with overweight can be quite high.
 
Are there other methods to lose weight?
Of course, there are cardiovascular workouts, strength programs with proper diet and facilitate fat loss and are effective alternatives to HIIT.
In conclusion, untrained people need preparation time at a lower intensity to print sufficient intensity to HIIT, and face to face to be effective and to have no risk of injury.

More on HIIT:
The best bodyweight burner/HIIT Program