I saw some other threads with Map My Run but couldn't find any about using the Nike Run app. I just went for a run and tried both, they weren't accurate to each other and to be honest I never verified my results with the Nike app but it seemed pretty good when I ran around a track. I know the Nike app talks to the Health app, but does it talk to the activity app? Meaning, can I just use the Nike app and will it update the activity app or do I need to use both? Will I still get the benefit of the activity app recording my heart beat? I really don't want to give up the Nike app (though the music control in the nike running watch app watch sucks right now).