Dr.-Ing. Rainer Blind from the Institute for Systems Theory and Automatic Control, Stuttgart University: https://www.researchgate.net/profile/Rainer-Blind called his Android app “a training tracker” an app for the really serious athletes four years ago: https://github.com/rainerblind This was 4 years ago when he has put a training tracker onto his GITHUB page. But is a training tracker still …