After three weeks of training, I can already feel an improvement - my leg muscles can run longer, the shape of my body is changing.
The change feels good - it feels VERY good - but it is only a tiny change so far, and I want more of it.
I catch myself wondering when I should squeeze in an extra run, maybe I should do doubles (morning and evening) to leave my rest days for rest. Already I am running through the cool-down instead of walking and, you know, cooling down.
So I am reminding myself that one of the strengths of a run/walk program is that it helps stave off injuries by only gradually increasing the load on the new runner.
If I attempt too much, too soon, I may well regret it.