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Rory only did aerobic cardiovascular exercise using interval training.Chipboard Screws Factory concept could encompass a whole article unto itself, but basically, your body becomes accustomed to anything that you expose it to for long periods of time. Aerobic cardiovascular exercise makes your body more efficient at burning fat.

But thats exactly what you dont want (If your car was more efficient at burning gas, youd use less of it). Same with your body. If your body becomes efficient at burning fat, you burn less of it for the same amount of work. So instead of burning 200 calories for your 2 mile run, you may burn 150 calories for the same distance in 2 months.

So youll have to increase the distance and continue to do this, just to burn the same 200 calories. This can eventually turn into running for an hour just to burn the same number of calories! I dont know about you, but this is exactly what I dont want to do. Interval training refers to a series of intense activity separated with short rest periods.

You want to make sure that you are constantly changing the intensity of your cardio workout during the whole workout, alternating from high intensity to low intensity. So a typical workout on an elliptical machine would be 5 min warmup, 1 minute at a high intensity (level 9or 10), then 2 minutes at a lower intensity (level 3 or 4).