which daily exercise helps to decrease suger level of dibetic man of 60 years old

My father (60 years old) use to walk more than one hour thrice in a week, smokes four cigarettes daily;drinks ulcohol ( two pegs) four days in a week,keeping fast for two days in aweek,consumes daily medicine for high B P and dibetis for control.please give exercise tips for his good health

Brisk walk daily for 30 minutes is good enough but try to stop smoking and alcohol gradually.