Fitness trackers, like Fitbit, been shown in several studies, like this one, to be ineffective helping with weight loss or fitness, and may have negative effects. Why? Several theories have been advanced, here's one of my own.. First, let me say that I'm speaking from experience. We have a couple of these things around our house and nobody knows where they are now.

Excercising with a Fitbit goes something like this:

I'm ready to go for a walk. 

Where's the Fitbit?

I thought it was on the nightstand.

Maybe I left it in the car.

Or the bathroom.

(looking... looking... 5 minutes later...)

Here it is! 

Oh, rats, I need to charge it.

I'll charge it up and walk tomorrow. 

There's an old adage that says "The hardest part of any journey is the first step". Fitbit fails because it takes the hardest part of working out (getting started) and makes it even harder.