Did you know that, if you updated to iOS 8.2 on your iPhone, it’s probably acting as a pedometer and tracking your steps and how many flights of stairs you’ve climbed — even if you didn’t ask it to?
My iPhone 6 Plus has been doing so since 5th March, which is when I updated to 8.2. You can view the data in the Health app and deactivate the feature in the Settings app by clicking Privacy > Motion & Fitness. In fact, some people have been claiming that this feature is eating battery life, so advise turning it off. I can’t say I’ve noticed any difference.
It’s not terribly accurate for me because I frequently leave my phone on my desk while I go off and do other things.