Why do people think fitness is judged entirely around how slim/toned someone looks? I know people who don't have an ounce of fat on them who literally look like they're going to die after playing football for 5 minutes.
Also, with the amount of training and running around footballers naturally have to do, I don't really get how it's possible to end up being particularly unfit. I mean unless the England camp are an utter joke Shaw was training every day in Brazil. If you're ok weight wise and training and not old, you must need to have a staggeringly bad diet to be in noticably bad shape fitness wise...and your fitness doesn't deteriorate in 10 days.
Van Gaal's probably being a little bit misleading. Some area of Shaw's game needs work and it's better to say it's a fitness thing than say "he's not good enough yet"...just guessing though.