Bunches of reasons:
#1---I just was released from PT due to my bialteral total knee replacements---I need to continue to build up my leg muscles.
#2---If I drive, it is a Ford F-150 4X4- (we heat our house with firewood---need the truck to pull a trailer and chainsaws and stuff)
#3---I find that I am more relaxed and can teach better after a ride to school, and I feel better about myself when I ride home from school
#4---I am, ironically, in better shape thatn my students who are decades younger than me.
#5---likethe ohers have said, I like to eat too much, so riding helps me keep the lbs. off.
Tim C.