I think this is a brilliant idea; myfitnesspal is the perfect analogy. I find the app somewhat cumbersome to navigate on a phone. I don't believe this is the fault of the app but rather inherent in the nature of phones because of the limitation of screen size. I could imagine a web app accessible from the taps bar on the
main page. It would mean I can look at the big picture stuff from the comfort of my deasktop/laptop but be able to carry around my individual daily training session with me in my pocket to the gym. I like this idea a lot.