There's no doubt about it; playing football and how tough it is on the body afterwards.
The course hitherto pursued in musical aesthetics has nearly always been hampered by the false assumption that the object was not so much to inquire into what is beautiful in music as to describe the feelings which music awakens.
Once a novel gets going and I know it is viable, I don't then worry about plot or themes. These things will come in almost automatically because the characters are now pulling the story.