Calories are King but Exercise is Vital

I've been using my stationary bike/elliptical machine daily now since restarting my diet. I had stopped using it for several months. I think it was partly the depression from quitting cigarettes but I just couldn't get motivated to do anything including exercise. They say exercise helps that feeling but it's a vicious circle, how do you get motivated to do something that will help break the depression when you can't get out of the depression? It took me so long to put this thing together back when I got it that I have to make good use of it. It really is a great way to work out at home. Here's a picture of it being put together in my living room a few months ago when I got it.