In the 1950s, Joslin proposed that exercise is the third essential component in blood glucose regulation for persons with type 1 diabetes, after insulin and dietary management(Roberson et al., 2009). Lately, exercise in an effective lifestyle management method for the prevention of type 2 diabetes and for the management of both type 1 diabetes and type 2 diabetes. For people with type 1 diabetes, aerobic exercise usually causes blood glucose concentration to drop rapidly, while anaerobic exercise may cause it to rise, thereby making glycemic control. For people with type 2 diabetes, learing first hand that regular exercise improves glucose levels may be a motivating factor in getting them to be more active(Riddell et al., 2009). Therefore, regular physical activity enhances insulin sensitivity, increases cardiorepiratory fitness, reduces the risk of cardiovascular mortality, and enhances psychosocial well-being. This paper discusses diabetes prevention and the acute and chronic benefits of exercise for individuals(youth & adults) with diabetes, along with the importance and impact of aerobic, resistance, or combined training upon glycemic control.