The reason for this is very simple; cardio training is the only activity where there is plenty of oxygen present.
And this is exactly what is needed for your body to burn body fat directly while you are doing your workouts.
Body fat can be used by your body only in the presence of oxygen, and the best way to provide your body with the optimum amount of oxygen for burning body fat, is by doing longer duration aerobic activities.
Walking, jogging, bicycling, stair climbing, rowing, cross-country skiing, elliptical exercises are the ones that work the best.
To create a lean, healthy body, you need to burn as many calories as possible from your body fat stores, and this can only be accomplished by performing longer duration exercises at a moderate to moderately high intensity level.
To lose stomach fat as fast as possible, start slowly with 10-15 minutes per session three times per week.
And as you get more advanced you can work your way up to doing cardio seven days per week.
This is the most effective way to burn body fat and to create a flat stomach.
This will also help you create a lean, healthy body, since by using cardio toburn body fat, you will burn fat from all of your fat cells, and this will eventually lead you to creating the body of your dreams.