36 min: City have got the upper hand now. United’s energy had dwindled a tad, unsurprisingly, and the visitors are hogging the ball and starting to stretch their hosts. 

That is a good observation. To press high you have to have energy. To lay back doesn't take as much. I'll tell you though, playing rope-a-dope is exhausting, just standing there in a crouch letting a guy wail on you. I'd rather be punching.