Despite the way I sometimes ruminate anxiously over an impending long run long before it’s begun, I secretly wish every day could be long-run Sunday.  Each day of the running week brings something special to the table, but long-run Sunday is possibly my favorite. To begin with, long-run Sunday actually starts on Saturday.  In my 30’s I’m finding that I’ve gotten less “fun.”  In a good way.  And as I get less “fun,” I actually look forward to turning in early on Saturday and focusing on hydrating instead of dehydrating.  I enjoy thinking about how my carb intake will come in handy and those few extra calories are actually going to serve…