Been using the Helath tracker to track my steps, weight and total distance from the day I got my 6 and 6 Plus. Is there a better app that does the same? The health apps is ok but not as friendly as I would like. What are you using and why. Also any apps that will use the data I have already accumulated with the health app. I have lost almost 25 lbs and do not want to loose this data. Any suggestions?