try to walk every day. find a tread mill or find a road around school thats a mile. try to walk 2 miles aday. u can walk a mile on a thread mill in 20 min. just change the incline a little steeper each month or two. u can walk when ever u want. change out the soda for iced tea. unsweetned , use sweet n low or some other sweetener if needed. soda has a lot of salt and makes u retain water. good luck! keep us updated on ur progress.