Well, I think I might have been the person who introduced the word 'concrete' into the discussion.
I think all I meant is that all the psychological abstract work in the world ain't gonna make much difference if we never translate thoughts into actions. Taking some concrete step, no matter how small, no matter how long/short, no matter what it is, etc, might make the first mental step a little more real. It brings it into the world of physicality, reality, action, etc.
Does that help clarify?