Britain's most successful Olympian Sir Chris Hoy told ITV News his "body made the decision" not to compete in the 2014 Glasgow Commonwealth Games.
Sir Chris added that he had "mixed feelings" about not taking part but looked forward to enjoying it as a spectator.
More top news
Kate will join Prince William on a tour of the Stephen Lawrence Centre before visiting a charity working with disadvantaged young people.
There is an "urgent need" for a "simpler and more trusted" system for investigating clinical failures, according to a damning report.
Over 100 mothers and fathers were investigated for leaving their children unsupervised in the final three months of 2014, new figures find.