Why is a cardio workout a must?
Well because when you are trying to lose weight one of the best ways is through cardio. What your body needs is to have your heart rate up higher than your calorie intake for the day. If you can do this you need to keep it up for 30-60 minutes depending on your weight and your goals. The calories you are burning are from years of build up of things your body does not recognize as a proper food source.
Doing cardio first thing in the morning, on an empty stomach, before you eat anything, is by far, the most effective. Whether you run, jog, walk, swim, jump rope, take an aerobics class, ride a bike, etc., doing it first thing in the morning is the best time to do it for maximum fat loss. Why? Its simple. When you do your cardio workout, you are burning calories. Lets say you wake up, eat breakfast, eat lunch later in the day, and then a few hours after lunch, you do your cardio. All you will be doing during that cardio is burning the calories and carbs of the food you just ate. When you do cardio first thing in the morning, you haven't eaten anything for the last 8 or so hours because you were sleeping. So, when your body sees that there are no carbs to burn, it goes directly to stored bodyfat. And stored bodyfat is the fat that is on your body, which is the fat that you want to lose!
Understand how it works? When you do your cardio sometime during the day other then first thing in the morning, you spend most of that time burning off carbs that you already ate that day. When you do it first thing in the morning, there are no carbs to burn, so all your body can burn is body fat!
So get up and get busy its one of the best ways to increase results.
Source: intense workout .com