Also, it recorded the number of flights of stairs I had climbed each day. In my level-access bungalow that doesn't even have a doorstep, and in shops I visited in my powerchair.
I think it was recording relative altitude, possibly even when I was driving (I live on top of a hill). It can't have been movement-based because I never do any kind of stair-climbing action. But I was horrified when I saw the records—imagine DWP got hold of that? I'd have been questioned under caution and need to find some way to prove I wasn't climbing stairs.
A helpful chap in the customer community for the device told me how to make sure it wouldn't record any more movement data and how to delete everything it had already captured, but it was pretty scary to discover it was set to record all that by default.