Arnold Schwarzenegger has reassured fans after a video emerged showing him being drop-kicked in the back during an event in South Africa.
The Hollywood actor-turned-politician was recording a Snapchat video inside a gymnasium when someone attacked him from behind.
The attacker was quickly detained by security, organisers said.
File photo dated 15/11/2014 of Arnold Schwarzenegger who has reassured fans after a video emerged showing him being drop-kicked in the back during an event in South Africa.
The governor of Sao Paulo, Joao Doria, (PSDB) received on Apr. 14, 2019 at the Bandeirantes Palace, the actor and former Governor of California Arnold Schwarzenegger to discuss actions of sustainability and green economy in Sao Paulo, Brazil. (Photo by Roberto Casimiro/Fotoarena/Sipa USA)
February 18, 2018; Los Angeles, CA, USA; Film actor Arnold Schwarzenegger in attendance as Team LeBron plays against Team Stephen during the first half of the 2018 NBA All Star Game at Staples Center. Mandatory Credit: Bob Donnan-USA TODAY Sports
LOS ANGELES - OCTOBER 30: (L-R) Christina Schwarzenegger, Arnold Schwarzenegger, Patrick Schwarzenegger, Maria Shriver and Katherine Schwarzenegger attend the premiere event for National Geographic�s global miniseries, "The Long Road Home" at Royce Hall on October 30, 2017 in Los Angeles, California. National Geographic�s eight-part global event series "The Long Road Home", a gripping and intimate look at the toll war takes on soldiers and their families, will debut with a special two-hour premiere Tuesday, Nov. 7, 2017, at 9/8c. The series moves to its regular date and time of Tuesdays at 10/9c beginning Nov. 14. (Photo by Scott Kirkland/National Geographic/PictureGroup)
Oct 3, 2017; Washington, DC, Former Republican Governor of California Arnold Schwarzenegger outside of the Supreme Court after oral arguments were heard inside the Supreme Court in Washington, DC. In the Gill v. Whitford gerrymandering case, Wisconsin Democrats argue that Republicans drew congressional district lines that all but guarantee GOP control of both houses of the state legislature. Mandatory Credit: Jack Gruber-USA TODAY NETWORK
Joao Doria, the mayor of the city of S�o Paulo, receives the actor, bodybuilder and politician Arnold Schwarzenegger (69) in the Matarazzo Building, central region of the capital in Sao Paulo, Brazil on April 24, 2017. (Photo by Fotoarena) Jo�o D�ria, prefeito da cidade de S�o Paulo, recebe na manh� desta segunda-feira (24) o ator, fisiculturista e pol�tico Arnold Schwarzenegger (69), no Edif�cio Matarazzo, regi�o central da capital. *** Please Use Credit from Credit Field ***
Arnold Schwarzenegger at "The New Celebrity Apprentice" Press Conference held at the Universal Studios Lot, Stage 17 in Universal City, CA on Friday, December 9, 2016. (Photo By Sthanlee B. Mirador) *** Please Use Credit from Credit Field ***
(L-R) Arnold Schwarzenegger and Boy George at "The Celebrity Apprentice" Season 8 Press Junket held at the Fairmont Miramar Hotel & Bungalows in Santa Monica, CA on Thursday, January 28, 2016. (Photo By Sthanlee B. Mirador) *** Please Use Credit from Credit Field ***
Arnold Schwarzenegger (left), Emilia Clarke (centre), and Jake Gyllenhaal (right) during filming of the Graham Norton Show at the London Studios, south London, to be aired on Friday.
Arnold Schwarzenegger in conversation with host Jonathan Ross during 'An Evening with Arnold Schwarzenegger', at the Lancaster London Hotel in London.
Kelsey Grammer, Arnold Schwarzenegger, and Antonio Banderas ride an armored military vehicle on the Croisette at the Expendables 3 photo call at the Cannes Film Festival on May 18, 2014, in Cannes, France. Francis Specker /Landov
Sylvester Stallone, Arnold Schwarzenegger and Harrison Ford at the Expendables 3 press conference at the Cannes Film Festival on May 18, 2014, in Cannes, France. Francis Specker /Landov
Arnold Schwarzenegger and Emma Thompson at the Empire Magazine Film Awards held at the Grosvenor Hotel, London.
Arnold Schwarzenegger and son Patrick arriving at the UK Premiere of The Last Stand, Odeon West End Cinema, Leicester Square,, London.
Photo Doug Peters EMPICS Entertainment
Guests Arnold Schwarzenegger and Miranda Hart during filming of The Graham Norton Show (TX: 22.35 Friday October 19, BBC One), at The London Studios in south London.
Sylvester Stallone and Arnold Schwarzenegger arriving for the UK Premiere of The Expendables 2, at the Empire Cinema, Leicester Square, London.
Arnold Schwarzenegger arriving for the UK Premiere of The Expendables 2, at the Empire Cinema, Leicester Square, London.
Arnold Schwarzenegger and Sylvester Stallone arriving for the UK Premiere of The Expendables 2, at the Empire Cinema, Leicester Square, London.
Mayor Boris Johnson (left) and Arnold Schwarzenegger take a ride on the Emirates cable car from Greenwich to the ExCeL in Docklands, after watching the Olympic basketball in Greenwich.
A file photo of Actor Arnold Schwarzenegger and his wife Maria Shriver acknowledge the crowd during Schwarzenegger's victory celebration party at the Century Plaza Hotel in Los Angeles on October 7, 2003. The power-couple's marriage has collapsed amid revelations that Schwarzenegger fathered a child with their live-in housekeeper 14 years ago but hid the truth from his wife which prompted wife Maria Shriver to leave the couple's home before they announced their separation. Photo:
London Mayor Boris Johnson takes former Governor of California Arnold Schwarzenegger (right) for a ride on one of his 'Boris bikes' during his visit to City Hall in London.
Prime Minister David Cameron and Governor of California Arnold Schwarzenegger watch the changing of the guard, during a visit to Wellington Barracks in central London.
Governor of California Arnold Schwarzenegger meets soldiers during a visit to Wellington Barracks in central London.
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Schwarzenegger, 71, the former governor of California, was in South Africa attending the Arnold Classic Africa sporting event.
The attack happened at the Sandton Convention Centre in Johannesburg, according to the Sandton Chronicle.
Schwarzenegger, known for starring in films such as Twins, Commando and The Terminator, tweeted to say he was fine.
He said: "Thanks for your concerns, but there is nothing to worry about. I thought I was just jostled by the crowd, which happens a lot.
"I only realized I was kicked when I saw the video like all of you."
Schwarzenegger added: "I'm just glad the idiot didn't interrupt my Snapchat."
The Arnold Classic Africa said the man had been handed over to police.
Schwarzenegger was born in Austria and first rose to prominence as a bodybuilder, winning the Mr Universe title aged 20.
After moving to Hollywood, he achieved worldwide fame in 1982 action film Conan The Barbarian, which launched his film career.
Schwarzenegger served as the 38th governor of California from 2003 to 2011.