Google Fit

I have two, identical, Samsung Galaxy phones.  Same make, same model. Bought at the same time.

I have Google Fit installed on both of them.  I turned them on at the same time this morning, and put both of them in the same pocket.  Now one of them is showing that I have 88 heart points, 10,775 steps, have burned 674 calories, went 7.14 km, and moved for 98 minutes.  The other shows 85 heart points, 10,509 steps, 667 calories burned, and 6.78 km walked.  Oh, and 98 minutes moved.

Identical phones.  Identical programs.  Identical pocket.  Identical walk.

You've got to question the accuracy of these things.