Dan Walker, 44, took to Twitter today to enlighten viewers about how the broadcaster covers the Olympic Games, after a social media user asked why the opening titles play every time they swap presenters.The former host of Football Focus is currently commentating from BBC's Tokyo Olympics studio, which is based in Salford, alongside co-host Sam Quek, and was happy to explain to keen viewers why the Olympic titles feature heavily in the broadcasting.One eagle-eyed viewer put their question onto the social media platform ahead of it being spotted by the presenter.They wrote: "Can anyone explain why the BBC Olympics coverage show suddenly ends when they swap presenter, then they play the opening titles of the Olympics and it starts all over.