Many years ago, I built a boat - quite a big one. When it was close to being finished, a lot of people came up to me and said "Gee-- did you build that??. How could you do it? It is so big! I couldn't build anything like that - you must be very clever" -- or words to that effect. I said "well I started with two pieces of wood, a drill , a screw and a screwdriver. I joined the two pieces of wood together with the screw. Then I got another piece of wood and joined it to the previous two. After a while it started to look like a boat - and after a lot longer it was a boat" .
I reckon our running is a bit like that. Every day we run adds a little bit to the person -- I think that I am starting to look just a little bit like a runner. My body doesn't even balk much at all anymore when I tell it to do 5Ks
How about you??