https://sementedechia.info/q48/ is just one of the sites which talks about and details for the individual, the complete breakdown of high intensity training.
What is high intensity training
https://sementedechia.info/q48/ explains high intensity training. It is a kind of training and the fact that this training is very specific. One can and often does interval training or intensity training however that does not mean that one is achieving HIIT.
Reasons to do HIIT
As per sementedechia.info/q48/ and various sites, this helps you to burn fat more efficiently, effectively and it also helps you reduce the amount of time you spend on workouts. This helps you see the fitness results that you desire and that too in a very short period of time. This helps the individual build muscle and sculpt their body much more effectively.
What are the main elements of an HIIT
There are cardio sessions which are in short bursts. The body needs to be pushed as much as it can endure during this time. These sessions last for periods ranging from 20 to 90 seconds. This helps to increase the metabolism and it helps to regulate the insulin levels. This in short is necessary for fat burning.
How do you know if you are working hard enough
If you want to gauge that you are getting the maximum of your workout, you should gauge the exercise on the Rate of Perceived Exertion scale. These sessions should be a 9 on a scale of 1 to 10 where 10 is the highest.
How does this help
When you work harder, the oxygen intake increases which means more calories are burnt. After the exercise too, due to the post exercise exercises which need to be done, the consumption of oxygen increases and so the metabolic rate increases and calories are burn even after ending the session.