Well in that case I’m that much more motivated to start working out.
So what does a fitbit do exactly? I mean besides counting your steps.
It takes your heart rate, weight, BMI (if you know your BMI to input it--no real accurate way to obtain it on your own--ideally you'd get that from your doctor, but gyms sometimes have the grab-handle things to give you a guess), your sex, age, step count, and gives you a pretty good estimate of your calorie burn through the day.
You can use the calorie calculator on the Fitbit app to watch things like total calories eaten, protein, carbs, fat, salt, iron, +++. You can also download the My Fitness Pal app and connect that to your Fitbit app (follow the instructions--very easy, even for me). I much prefer the My Fitness Pal app, but it's been a long time since I used the Fitbit one.
If you wear it to bed, it can analyze your sleep surprisingly well.
It will vibrate on the hours you set it up for, to remind you to get up and move if you have logged fewer than 250 steps in that hour.
It can recognize certain exercises and automatically give you an analysis of your calorie burn for (say) a bike ride or a jog, etc.
It can give you a (partial) readout of text messages on-screen and vibrate to signal phone calls on your cell.
There are other things as well, but you likely won't use all of them. I have a Charge 2. I looked at the 3, but there didn't seem to be enough difference to convince me to buy a new one. I have to charge this one more often, but it's not a big deal yet.