High intensity exercise will burn more calories, work your muscles harder and deliver faster results, right? That would appear to be common sense however some people still believe that to achieve fat burning you need to exercise at a moderate level to remain in the "fat-burning zone". This view is based on the fact that during low intensity exercise the body is primarily drawing on fat as fuel and during higher intensity exercise it uses up more carbohydrates. This leads many to believe that long duration low intensity exercise is best for body fat reduction. This is simply not true.
While true that at low intensity you burn a greater percentage of calories from fat the fact is that at low intensity you are burning far fewer calories. Although many factors are involved in exercise induce weight loss the most critical factor is total calories expended. The more calories you burn, the more fat you burn. It is also important to take into account the fact that high intensity exercise provides a metabolic boost that will continue to burn calories at a greater rate for hours after your workout.
With regards resistance training, it is true that it is important to work a certain number of repetitions depending on your goal but it will not get results unless the intensity is high enough to create the stimulus. Also everyone is different so depending on your genetics, what typically would be considered a rep range for muscle building may not work for you. This is where you must experiment a little and judge what exercises, repetitions and routines stimulate your muscles the most to grow.
There are no hard and fast rules apart from the necessity to train intensively and use proper technique. For best results you should aim for muscle failure on each set i.e. you reach the point where you can't complete another rep without sacrificing technique.
Most exercise professionals agree that high intensity exercise is necessary to achieve significant changes in body composition.
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