Original review: This has for to be one of the worst apps. It always seems to have problems. For example, its journal does not update any more on my phone. And there is no way to get any help whatsoever. Updated: After the Google response here was posted, without my doing anything special, my device suddenly displayed the journal for today's (today is Friday) activity. It could not, though, display the journal for Wednesday and Thursday's activities. Wednesday and Thursday's activity's data WAS available on the other Google Fit screens (for example, the screen showing the number of steps). Interestingly, the activites normally present on bottom of those screens did not display... it just said "see source data", which indeed was available. The top of the screen displayed normally. I then did the steps outlined in the Google post (clear cache and data, uninstall, reboot, install.... and the situation was exactly as in the paragraph above (ie, no changes). My conclusion is that there is a way to "fix" what is happening, but Google personnel have to activate it. I would rate the Google responsiveness as very high.... their response to my review was posted extremely quickly. Next update (the following Sunday): Back to one star and the feeling that this app is just IMPOSSIBLE. I took a walk of about an hour this morning, and when looking at the app afterwards, it showed zero steps and zero minutes. When I flipped to the Journal page, there was a colored line under the word Journal that was blinking, but no data. So I cleared, uninstalled and installed, and although I did not get the missing data, my device did start counting steps and minutes afterwards. To the extent that the world depends on Android and Google for software, this is a very scary thing. The software quality seems incredibly low.