Sometimes I feel tired and do not have the mood to get on the bike. I know It is good to go but I just do not feel like doing so. I say to myself just get out and go for a short one, just an easy short one.
I then start getting dressed and while doing so, my head and mood start changing, it is as if the initial "no" goes away as I have already decided to get out, even if it is just for a small ride. 
When I get on the bike and out my head starts thinking about the path to choose, this way or this other. Taking this one is short but if I change my mind I can go further away for a longer one.
I usually end up taking a much longer ride than I initially planned because I feel comfortable once I have been able to reverse that initial feeling. When I come back to the house, after a shower, I feel glad I was able to take a longer ride again.