Physical exercise is any bodily activity that enhances or maintainsphysical fitness and overall health and wellness. It is performed for various reasons including strengtheningmuscles and the cardiovascular system, honing athletic skills, weight loss or maintenance, as well as for the purpose of enjoyment. Frequent and regular physical exercise boosts theimmune system, and helps prevent the "diseases of affluence" such as heart disease, cardiovascular disease, Type 2 diabetes and obesity.[1][2] It also improves mental health, helps preventdepression, helps to promote or maintain positive self-esteem, and can even augment an individual's sex appeal or body image, which is also found to be linked with higher levels of self-esteem.[3] Childhood obesity is a growing global concern[4] and physical exercise may help decrease some of the effects of childhood and adult obesity. Health care providers often call exercise the "miracle" or "wonder" drug—alluding to the wide variety of proven benefits that it provides.[5][dead link][6]
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