Cristiano Ronaldo dribbled up and down six football pitches after training every day in his first spell at Manchester United, according to tennis coach Patrick Mouratoglou.
Mouratoglou, who is Serena Williams's tennis coach, has given insight into the hard work Ronaldo put in during the early stages of his career.
The strict fitness regime and diet Ronaldo sticks to is no secret but Mouratoglou has now lifted the lid on the extra yards on the training field.
'I know many soccer players who played with him,' he said in a clip on social media platform Instagram.