As many runners will have experienced, when you buy a new pair of trainers the temptation is to wear them all the time - and why not? They're more comfortable than your old battered pair, they look better and - whether a psychological side effect or not - they make you run that little bit faster.
But one day there will come a time when you have to crawl back to the very shoes you so eagerly disregarded. Maybe your new wheels are still soaked from the day before, or you're running a trail and don't want to dirty your road shoes. Whatever the reason, when you run there's something missing; that bounce isn't there, that extra spring in your step that comes with confidence and being comfortable. It just doesn't quite work.
On Tuesday evening in Copenhagen, Manchester City experienced something similar for the first time in years. Pep Guardiola 's side played out a goalless draw against FC Copenhagen in their fourth Champions League outing of the season, six days on from thumping the same opposition 5-0 at home.
