What is the purpose of doing physical exercise

Purpose：Exercise is physical activity that is planned,structured,and repetitive for the purpose of conditioning the body.Exercise is essential for improving overall health,maintaining fitness,and helping to prevent the development of obesity ,hypertension ,and cardiovascular disease.
The whole essay as follows:
Exercise is physical activity that is planned,structured,and repetitive for the purpose of conditioning the body.Exercise consists of cardiovascular conditioning,strength and resistance training,and flexibility.
Exercise is essential for improving overall health,maintaining fitness,and helping to prevent the development of obesity ,hypertension ,and cardiovascular disease.Surveys conducted by the Centers for Disease Control and Prevention (CDC) indicate that 61.5 percent of children aged nine to 13 years do not participate in any organized physical activity (for example,sports ,dance classes) and 22.6 percent are not physically active during their free time.According to the American Obesity Association,approximately 30 percent of children and adolescents aged six to 19 years are overweight and 15 percent are obese.
A sedentary lifestyle and excess caloric consumption are the primary causes of this increase in overweight and obesity; regular exercise is considered an important factor in controlling weight.Overweight and obese children and adolescents are at higher risk of developing several medical conditions,including the following:
• asthma
• diabetes
• hypertension
• orthopedic complications,such as hip and knee pain and limited range of motion
• cardiovascular disease
• high cholesterol
• sleep apnea
• psychosocial disorders,such as depression,negative body image,and eating disorders
Clinical studies have shown that regular exercise has numerous benefits,including the following:
• preventing weight gain and maintaining healthy weight
• reducing blood pressure and cholesterol
• improving coordination
• improving self-esteem and self-confidence
• decreasing the risk of developing diabetes,cardiovascular disease,and certain types of cancer
• increased life expectancy