Nowaday so many people are challenged by the disease of obesity. The main causes include biological and non-biological factors such as heredity, age, sex, occupation, physical inactivity, eating habits and physiological factors (jensen et al., 2008). Complications are either directly caused by obesity or indirectly through mechanisms sharing a common cause such as poor diet or a sedentary lifestyle. Therefore this book is mainly focussed on the effect of selected intensity aerobics physical training program on the reduction of body weight.