Though the app has kept me motivated through great coaching, it gets bogged down during the process of saving the run and sometimes deletes the run data, which kind of defeats the purpose of using the app. Sometimes it gets snagged early in a run, so you have to manually stop and restart the run or actually discard it. I've had to uninstall the app and reinstall it twice. Also, it doesn't always capture accurate mileage when you're running indoors as opposed to my fitness watch.