My pal George has been doing one-hour runs with some consistency. After seeing his updates, I decided to make effort to retain win the money that he has offered if I beat him.
So out I went, intending to run for 30 minutes straight, even uphill on my way back.
As usually happens, thoughts of doing 10 min x 3 or 15 min x 2 played in my mind. I am doing 30 minutes, I said to myself, and I did.
Running is largely mental. Sometimes I want to stop when there really is no physical reason to. Training is partly to train the mind to keep going.