I've never used a training program of any kind. And unless I am unusually sore or tired or sick, this is my workout schedule almost every single week, even if I am doing a back to back. If I skip a workout, it's AFTER a race, usually the day after (so most likely a Monday).
Sunday - Usually off unless I am racing. If I'm super motivated, I might do a short run.
Monday - Treadmill at the gym. Try to get in 8-8.5 miles. For me that means I'm on the treadmill 80-85 minutes. I usually do a hill program for the first 60 minutes and then do increased speed for whatever time I have left.
Tuesday - BodyPump at the gym. I usually have 20 minutes or so after class for other cardio. I really hate the elliptical so usually I will do Crossramp. Sometimes I run. Depends on if I have any aches and pains or what my mood is.
Wednesday - Essentially the same as Monday. I used to do speed workouts (Yasso 800s), but it's been months since I've done those since my foot/ankle was bothering me last fall.
Thursday - Essentially the same as Tuesday.
Friday - Usually off, although sometimes I'll do a short run (30-60 minutes)
Saturday - Longish run if I'm in the mood or racing.
So you see... not much of a "plan" there. I try to get in at least 25 miles a week. I think that gives me a good enough base to where I can run at least a 13.1 without pain/injury.
Thanks for the question!