A few years back I (a diabetic) was part of a trial study at a local hospital on the affect of exercise on sugar levels. They measured my level before, during, and after a half-hour of exercise which included some easy stretching, biking, and walking a hallway. In that 30 minutes, my level dropped 90 points! I don't know if other's in the study had the same results because of confidentiality but I certainly have tried to keep this as a lesson on how to go forward.
Best of luck to you and your husband!