Let me tell my experience with those: about 5 years ago I started to live healthy. I got reasonably fit, my BMI became fantastic, I even had visible abs for some years. But I couldn't run more than 200 meters without fighting for my life.
These apps have like a 30-50 days schedule: run 2 minutes, walk 2 minutes, repeat 10 times, then the walk/run intervals keep changing, until the end it reaches 30 minutes of continuous run.
I did everything to the T, but still, I was struggling, and felt dying around day 7 or so. I started these a couple of times, but I have no idea who can really complete them. (Okay, today I can run 10K, but that took literally years of trial and error...)
I don't know if the above sounds familiar, or makes any sense to you. If yes, is it somehow addressed in your solution?