In high intensity training, you actually train your muscles with a particular exercise until you reach the point of muscle fatigue. It means that you start exercising with fervor and stay at it until you cannot do any more. There are many ways you can get high intensity into your workout. You can increase the number of repetitions you do, have less rest time in between exercises, increase the number of times you train every day or increase the speed at which you do the exercises.

Instead of low intensity workouts where the muscles are just tired or may be not even tires at all, when you are finished a high intensity workout, your body is totally exhausted.

When you want to do high intensity interval training, you should try to increase the amount of resistance every time you exercise. You challenge your muscles and force them to respond to the extra demand.

You have to make sure that you perform each repetition with the proper technique so that you will not seriously injure yourself. You should strength train with high intensity for no longer than an hour at a time and emphasize the major muscle groups of the body.

Whenever possible in high intensity interval training work your muscles from the largest to the smallest. Start with your hips, then move to the legs, upper torso, arms and finally the muscles of the lower back. You should not exercise at a level of high intensity every day.

Because the workout depletes the carbohydrates, your body needs a rest period of at least 48 to 72 hours between exercise periods. This is different from low intensity training where you can exercise every day.