الفهرس 
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Abstract
The prevalence of overweight and obesity had a dramatic increase in their incidence in the last three decade, which prompted WHO to label obesity as a global epidemic disease. Overweight and obesity affect self esteem, body image and it is well-known that persons who are overweight or obese are at an increased risk for psychological disorders (WHO, 2014)..
Egypt is the fattest African country. Its also the 14th fattest country in the world, according to the most recent World Health Organization statistics issued for the year 2010 (WHO, 2014). Statistics issued by the Egyptian Medical Association for the Study of Obesity in early 2010 estimate that 15 percent of Egyptian (school-age) children are obese, in comparison with its 1990 estimate of only six percent. Being overweight or obese is determined according to Body Mass Index--with varying measurements for the different age groups and genders (WHO, 2014).
Obesity is a well-recognized risk factor for various chronic health problems such as cardiovascular diseases, hypertension, stroke, type 2 diabetes mellitus, osteoarthritis and certain cancers. These conditions not only lead to reduced quality of life given their protracted nature, they also lead to premature death (Campbell, 2011).
Available evidences showed that one of the effective ways to prevent obesity in the adult life is prevention and management of adolescent overweight and obesity. Obesity is preventable and the prevention of weight gain is easier, less expensive, and more effective than treating obesity if it has fully developed. For adolescents, the management and prevention of obesity are based on A well designed exercise program combined with decreased caloric intake can be effective in promoting significant weight loss. With use muscles consume energy derived from both fat and glycogen. Due to the large size of leg muscles, walking is the most effective means of exercise to reduce body fat. Exercises affects macronutrients balance. During moderate exercise, equivalent to a brisk walk, there is a shift to greater use of fat as a fuel (Sahlin et al., 2008).