The first one is tiny steps.

You  need to know what your next steps are and they need to be manageable. I have not yet really committed on doing a half marathon this year but I am getting accustomed to the idea. At first it looks like a big thing and at the moment I am not really willing to spend so much time in the evenings just with running. But I was at the gym. And it makes me feel good. Not only because I think yes I did it but also because it is good for my body. And then, I am planning tp go to the gym with a friend. This 

This  is the second step: accountability.