Match fitness and being heavy aren't related at all, that's just general fitness. If we played someone like Nkounkou now would you say he wouldn't be match fit? He's made less appearances than that but there's no reason for him not to be match fit. It's a bit of a misnomer I think, you might not be match sharp (ie a bit out of practice) but match fit? Absolutely no reason why you wouldn't be if you're training every day, and 4 starts and 6 sub appearances in a just over a month like King has made should be more than enough to blow away any cobwebs or rust and get you match fit.