.....Hard, physical work.....
Last spring I broke my leg. During the period of forced inactivity my carefully controlled numbers went to hell.
For me, exercise and work are the primary factor. I take Advicor and aspirin, but neither are completely effective without daily exercise.
My grandfather tended a 2-acre yard for their ma and pa motel up until the age of 90. What did he do? He used a push mower - no self-propelled anything and was picking weeds by hand. He was in better shape at age 90 than a lot of 30 yr. olds are, simply by doing basic human movement every day - walking, bending/stretching, pushing around small machinery - and lots of it.