When I first purchased this app it seemed to work OK. However, it stopped saving my data. It would be there, I would save it, but when I would go back to see the information it would be gone. I reported this and after a couple of weeks it seemed to have been fixed. However, it has started a new problem. I start the app at the beginning of my walk or run. It appears to be working. I lock the phone or waits until it auto locks, and when I get back from my run the app is not running and nothing has been recorded. I have reported the problem but to no avail. At this point I find this app totally useless. I am going to try another app.