Downward dogs and yoga mats have replaced cars and buses on London’s Tower Bridge as part of Car Free Day.
The mass yoga session was one of a number of activities taking place in the capital as more than 16 miles (27 km) of streets were shut.
Bank junction has been turned into a festival space while children will race go-karts in the Square Mile.
The closures will be in place until 19:00 BST with roads elsewhere expected to be busy as a result.
Tower and London Bridge were shut at 07:00 along with streets in parts of the City, Southwark and Tower Hamlets.
Among the other activities taking place are a hedge maze in Cheapside and classic cycle rides on Tower Bridge.
Organisers hope more than 150,000 people will join the event which has been named Reimagine.
Away from the centre, 15 boroughs will be running their own Car Free Day celebrations and more than 340 “play streets” – safe spaces for local people to socialise and play – have been approved some 24 boroughs.
London’s Mayor Sadiq Khan said the day was about “demonstrating our commitment to cleaning up our toxic air and experiencing a greener way of living”.
Transport for London has warned that those who do take to the roads should expect “significant delays”.
Napoli have signed Spain striker Fernando Llorente, who left Tottenham at the end of last season.
Llorente, 34, joined Spurs in 2017 and scored the vital away goal in their Champions League quarter-final win at Manchester City in last season.
Before that, he spent a year at Swansea City, helping them avoid relegation from the Premier League in 2016-17.
Llorente previously played in Italy with Juventus between 2013 and 2015, winning two Serie A titles.
Capped 24 times by Spain, the forward spent nine season at Athletic Bilbao before his spell at Juve, and then a year back in his homeland with Sevilla.
Llorente, who won the 2010 World Cup and Euro 2012, almost joined Chelsea – then managed by Antonio Conte, his former boss at Juventus – prior to signing for Spurs.
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