I used to just use the Moves.app to record the number of steps I've taken daily, but motion tracking now seems to be a built-in feature of dozens of apps on my phone and things have now gotten more complicated. I am using the new iPhone 6 Plus running 8.0.2, and I know that the new Health.app counts my steps. What I would like to know is whether or not it affects the battery life of my phone to have other apps (in addition to Health.app) keeping track of the number of steps I've taken. Assuming I have motion activity tracking switched on in the Health.app, will also enabling this feature in Moves.app, MyFitnessPal.app, Withings.app, Argus.app, etc. further drain the battery of my phone? Or is it the kind of thing where all apps reference the same motion tracking data? Thanks!