My main issue with apps and even paper notebooks is every time you go to the gym you have to take an action.

If I lay out a schedule for 6 weeks with exactly what I'm going to do with dates, all I have to do is cross it off. And if I don't remember to cross it off, it's fine because I can just go by the day.

I found I was much more likely to stick to a long program when I did that vs logging it the old fashioned way.