If you are on a mission to lose weight, any kind of physical activity is desirable. Losing weight is a mixture of several elements, including physical activity, proper diet and discipline. Weight loss is typically achieved by consuming less calories than you spend. In order to successfully burn fat, you have to create about 500 calorie deficit per day. You can create your food intake or increase in physical activity with lowering the deficit. So the answer is that you can lose weight just doing cardio exercise when it creates a daily calorie deficit.
However, human body is an adaptive organism. Force doing the same type, frequency and duration of cardio workouts for many weeks or months your body adjust. If you do not see any improvement for at least three weeks, you have probably reached a plateau with your current diet and exercise program. This means that you are probably consume about the same amount of calories that you spend. At the high level, you have to either get you further reduce your caloric intake or increase the duration and frequency of cardio exercise, or both.
However, human body is an adaptive organism. Force doing the same type, frequency and duration of cardio workouts for many weeks or months your body adjust. If you do not see any improvement for at least three weeks, you have probably reached a plateau with your current diet and exercise program. This means that you are probably consume about the same amount of calories that you spend. At the high level, you have to either get you further reduce your caloric intake or increase the duration and frequency of cardio exercise, or both.
Here comes the discipline factor. If you are happy with the weight you have lost, you can just keep doing what you have done are. You have already improved your health due to increased physical activity and proper nutrition. However, if you want to lose more weight, you need to get to the limits. This is where the negative part of the cardio workouts come. Doing just long cardio workout, your body will adapt by losing fat, but you will also lose muscle mass in the process.
Let us say that you minutes the duration of your cardios 30 minutes to 90. Your body will react by losing the extra weight and the hardest tissue in the body's muscle tissue. Muscles play an important role in your metabolic rate and with less muscle means your body now needs fewer calories per day to support its basic functions. This means that your new weight, you need to further reduce your caloric intake and do hours of cardios per week just to keep remain at current levels. This can really test your discipline!
The solution to this problem is to build muscle mass by lifting weights or adding the anaerobic component of your cardio workout. Anaerobic exercises build muscle and have an added advantage of increased metabolic rate hours after you have completed your training program. With this approach, you can spend less time in the gym and do not have to constantly reduce your calorie intake to burn fat. Increase muscle mass speeds up your metabolism and your body will actually need more calories just to get the new body composition....
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