The fitbit is a high end pedometer, with extra fun play functions.
It talks to your iThings, sends you cute little messages of encouragement, and, of course, there is an App for all that.
(You can also obsessively enter all your food intake for that extra encouragement).
The interesting thing is it works.
I got the cute plum
purlply pink one, my better half having confiscated the pretty blue…