It's been two months and most weeks I've made it to the pool 3 times a week. Not every week, but I'm satisfied that this new exercise regimen has taken hold. The most difficult thing is forcing myself to get out of the pool to take a shower and get to work on time!
I'm also gradually changing the way I eat - a major hurdle - to accommodate the exercise since I can't jog on an empty stomach - nor on a full one - so I'm experimenting with small, nutritious, safe-to-eat-while-driving snacks.
My first goal is the stamina to stand all day at WDW at the end of the year. So far, I'm usually able to feel satisfied with my progress as a good start after years of not doing anything, although I sometimes vacillate between "this is a good start" and "I'm not progressing fast enough." Only time will tell.