Aerobic exercise is the only form of exercise where you use two sources of energy: carbs (blood glucose) and fat.
The Surgeon General advises us that, to be healthy, we need to exercise at least three to four times a week, in an aerobic zone, for 20-30 minutes. That is a standard to keep your heart healthy, not to lose body fat by burning calories.
Here's an eye opener exercise tip. For the first 20 minutes you exercise in your aerobic zone, you are burning about 80% carbohydrates and 20% fat.
For the next 20 minutes, you are burning about 50% carbs and 50% fat. You're getting better. Now you're gonna start to lose some of that weight as the fat is being burned!
So what happens if you start exercising into the above 40 minute range?
A reversal. You are now burning about 20% carbs and about 80% fat.
In other words, when you are exercising beyond 40 minutes, you're doing some serious fat burnin'!
So if your goal is losing weight, your exercise routine should be in the 45 - 60 minute area.
