This is what Haruki Murakami says in his book "What I Talk About When I Talk About Running";
“For me, running is both an exercise and a metaphor. Running day after day, piling up the races, bit by bit I raise the bar. And by clearing each level I elevate myself.” “Failure to reach that bar is not something you can easily explain away. When it comes to other people, you can always come up with a reasonable explanation, but you can’t fool yourself. In this sense, writing novels and running full marathons are very much alike.”
Of course, he is a fulltime novelist and I am a novice, but my attitude is just the same.