it's strange but i see no way of turning off Health App collecting data in the background (steps/flights of stairs). this is probably not a big deal for the iPhone 6 or 5S which have supposedly the low power consuming M7/M8 chips. but how about for phones like the iPhone 5? i am cleaning up my old iPhone 5, have installed iOS8 on it, and will give it to my wife soon once her nano sim arrives (cricket). i'd like to turn off any background health app stuff to optimize battery life on the phone for her.