Acrobats perform during a presentation of the new show 'Ecolibrum’, dedicated to modern ecological problems, at the National Circus in Kyiv, Ukraine February 6, 2021. REUTERS/Valentyn Ogirenko

Acrobats perform during a presentation of the new show 'Ecolibrum', dedicated to modern ecological problems, at the National Circus in Kyiv, Ukraine February 6, 2021. REUTERS/Valentyn Ogirenko

An acrobat performs during a presentation of the new show 'Ecolibrum', dedicated to modern ecological problems, at the National Circus in Kyiv, Ukraine February 6, 2021. REUTERS/Valentyn Ogirenko

Acrobats perform during a presentation of the new show 'Ecolibrum', dedicated to modern ecological problems, at the National Circus in Kyiv, Ukraine February 6, 2021. REUTERS/Valentyn Ogirenko

An acrobat performs during a presentation of the new show 'Ecolibrum', dedicated to modern ecological problems, at the National Circus in Kyiv, Ukraine February 6, 2021. REUTERS/Valentyn Ogirenko

An acrobat performs during a presentation of the new show 'Ecolibrum', dedicated to modern ecological problems, at the National Circus in Kyiv, Ukraine February 6, 2021. REUTERS/Valentyn Ogirenko

Passers-by look at acrobats performing inside of a closed bar amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, January 21, 2021. REUTERS/David W Cerny

Passers-by look at acrobats performing inside of a closed bar amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, January 21, 2021. REUTERS/David W Cerny

A passer-by looks at acrobats performing inside of a closed bar amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, January 21, 2021. REUTERS/David W Cerny

A closed bar is seen behind acrobats performing in a window to cheer passers-by amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, January 21, 2021. REUTERS/David W Cerny

Acrobats perform inside of a closed bar to cheer passers-by amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, January 21, 2021. REUTERS/David W Cerny

Actors and acrobats Kira Davies and Pierre Quemard practice a maneuver at Washington Square Park as the global outbreak of the coronavirus disease (COVID-19) continues, in New York City, U.S., November 14, 2020. REUTERS/Caitlin Ochs

Acrobats perform during a presentation of the new show 'Birthday. Circus Festival' at the National Circus in Kyiv, Ukraine October 10, 2020. REUTERS/Valentyn Ogirenko

Acrobats perform during a presentation of the new show 'Birthday. Circus Festival' at the National Circus in Kyiv, Ukraine October 10, 2020. REUTERS/Valentyn Ogirenko

An acrobat performs during a presentation of the new show 'Birthday. Circus Festival' at the National Circus in Kyiv, Ukraine October 10, 2020. REUTERS/Valentyn Ogirenko

Acrobats perform during a presentation of the new show 'Birthday. Circus Festival' at the National Circus in Kyiv, Ukraine October 10, 2020. REUTERS/Valentyn Ogirenko

Acrobats perform during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny

Acrobats perform during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny TPX IMAGES OF THE DAY

Acrobats perform during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny

Acrobats perform during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny

An acrobat performs during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny

An acrobat performs during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny

Acrobats perform during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny

An acrobat performs during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny

An acrobat performs during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny

An acrobat performs during a performance of the fairytale "The Shepherdess and the Chimney Sweep" by Hans Christian Andersen over Prague's rooftops, Czech Republic, August 25, 2020. REUTERS/David W Cerny

Acrobats perform at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

An acrobat performs at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

Acrobats perform at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

Acrobats perform at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

Acrobats perform at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

An acrobat performs at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

Acrobats perform at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

Acrobats perform at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

Acrobats perform at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

An acrobat performs at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

Acrobats perform at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

Acrobats perform at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

Acrobats perform at the Zippos Circus during the show called "Rebound!" on its opening night, in Brighton, Britain August 11, 2020. REUTERS/Henry Nicholls

French elite acrobatic flying team "Patrouille de France" (PAF) performs a flying display of the French national flag over the Luxor Obelisks during annual Bastille Day military ceremony on the Place de la Concorde in Paris, July 14, 2020. Ludovic Marin/Pool via REUTERS

French troops members parade as the elite acrobatic flying team "Patrouille de France" (PAF) performs a flying display of the French national flag over the Arc de Triomphe on the background during annual Bastille Day military ceremony on the Place de la Concorde in Paris, on July 14, 2020. Ludovic Marin/Pool via REUTERS

Guests watch the French elite acrobatic flying team "Patrouille de France" (PAF) performing a flying display of the French national flag over the Luxor Obelisks during annual Bastille Day military ceremony on the Place de la Concorde in Paris, France July 14, 2020. Ludovic Marin/Pool via REUTERS

French elite acrobatic flying team "Patrouille de France" (PAF) performs a flying display of the French national flag over the Arc de Triomphe during the Bastille Day military parade honouring French health workers and their dedication in the fight against the coronavirus disease (COVID-19), on Place de la Concorde in Paris, France July 14, 2020. Ludovic Marin/Pool via REUTERS

French elite acrobatic flying team "Patrouille de France" (PAF) performs a flying display of the French national flag over the Arc de Triomphe during the Bastille Day military parade honouring French health workers and their dedication in the fight against the coronavirus disease (COVID-19), on Place de la Concorde in Paris, France July 14, 2020. Ludovic Marin/Pool via REUTERS

Acrobats perform as residents dine at a 500-metre-long table spanning across the length of the medieval Charles Bridge as restrictions ease following the coronavirus disease (COVID-19) outbreak, in Prague, Czech Republic June 30, 2020. REUTERS/David W Cerny

Acrobats perform as residents dine at a 500-metre-long table spanning across the length of the medieval Charles Bridge as restrictions ease following the coronavirus disease (COVID-19) outbreak, in Prague, Czech Republic June 30, 2020. REUTERS/David W Cerny

Acrobats perform as residents dine at a 500-metre-long table spanning across the length of the medieval Charles Bridge as restrictions ease following the coronavirus disease (COVID-19) outbreak, in Prague, Czech Republic June 30, 2020. REUTERS/David W Cerny

Swiss acrobat Freddy Nock poses for a picture after performing during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse

Swiss acrobat Freddy Nock poses for a picture after performing during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse

Swiss acrobat Freddy Nock poses for a picture after performing during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse

Swiss acrobat Freddy Nock is seen after performing during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse

Swiss acrobat Freddy Nock poses for a picture after performing during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse

Swiss acrobat Freddy Nock is seen after performing during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse

Swiss acrobat Freddy Nock poses for a picture after performing during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse

Swiss acrobat Freddy Nock poses for a picture after performing during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse

Swiss acrobat Ramon Kathriner performs on a pole during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse

Swiss acrobat Ramon Kathriner performs on a pole during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse

Swiss acrobat Ramon Kathriner performs on a pole during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse

Swiss acrobat Freddy Nock climbes to balance on the cable of the Glacier 3000 cable car during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse

Swiss acrobat Freddy Nock climbes to balance on the cable of the Glacier 3000 cable car during the Airshow, marking the reopening of facilities after the coronavirus disease (COVID-19) lockdown in Les Diablerets, Switzerland, June 23, 2020. REUTERS/Denis Balibouse