http://issuu.com/sportingpublications/docs/sports_fitness_lr Interview with former Man Utd fitness coach, starts page 42, here is what he said about Rooney
"Wayne did some boxing with me and you could tell he'd boxed before. It's probably the only bit (of gym work) he enjoyed. The only time he really gave absolutely everything was when he broke his metatarsal before the 2006 World Cup. He worked his socks off then and show what a great athlete he could have been - to me, he could've been better than he is now. If he'd have come closer to matching the work Ronaldo did he'd have been an absolutely massive player, but he didn't.
I remember looking in a magazine that listed the world's top 100 players. Ronaldo was No. 1 and Rooney was something like 17th. I think that he would've been closer, or Wayne could have eventually taken top spot, if he'd been able to emulate Ronaldo's attitude towards the gym."
Has been hinted at that one of the reasons Ferguson grew more and more frustrated with him was his poor fitness, remember reading he would usually come back from pre-season in worst shape out of most of their players. If he does join does it does make you wonder whether he would be dedicated enough to put the work in when he didn't do it for Man Utd. The article doesn't exactly state he is the worst trainer in the world but kinda hints at it. Not surprised to hear about C.Ronaldo's dedication in the gym, guy looks built like a tank these days.