How often do you exercise ? I exercise twice a week .
你多久锻炼一次?我每周锻炼两次。
How often do you exercise ? Three to six times a week .
你多久运动一次?我一周运动三到六次。
How often do you exercise ?
你多长时间锻炼一次?
Peter , how often do you exercise ?
彼得,你隔多长时间锻炼一次身体?