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Mick Clegg worked with Christiano Ronaldo as his athletic trainer during his first spell with Manchester United. At the time Ronaldo was 18-24 years. During that time Ronaldo did not lift heavy weights, instead he used light weights and gradually stepped up the intensity with repetitions or changing the weight lifted. 

Ronaldo is on a Mediteranean diet with particular attention to protein for the training he does. Without the diet he would not have the body he has with hardly any fat. He also takes carbohydrates to make sure he keeps up his energy level, and vitamins, minerals. 

Mick Clegg points out that people on Mediterranean type diets take afternoon naps and Ronaldo takes a nap in the afternoon. A 40 minute nap in the afternoon after eating helps one to recover from the hard work of the morning, says Clegg.

Christiano's mental attitude stands out in Clegg's experience working with him- his determination. He set a goal of working harder than Welshman Ryan Giggs, and was keen on taking the advice of experts and incorporating it into his routine. It is this that makes Ronaldo the player that he is. There is also a sense of calm about Ronaldo in a game where he remains composed till an opportunity comes late in the game as in the game with Villareal. At 36 in his second time with Manchester United Ronaldo is far stronger mentally than when he left Manchester United in 2009, says Clegg.