There are probably apps that target what you're talking about and I don't know what they are. But I do use an iPhone app for weight lifting (stronglifts.com) an

There are probably apps that target what you're talking about and I don't know what they are. But I do use an iPhone app for weight lifting (stronglifts.com) and I can tell you that an app definitely helps immensely. Instead of me wandering around wondering what to do next, I leave that to the app. 90-180 seconds between sets? Keeping track of progress? Increasing progressions? Took a couple of weeks off and need to reset? I leave that to the app. I leave the details to the app. I still take responsibility for decisions like whether, when and how much to increase. So I'd encourage you to look for an app. I just don't know which one.