Arnold Schwarzenegger has been drop-kicked from behind while watching athletes in South Africa.

The Terminator star was filming an athlete jump role while in a gym at the Arnold Sports Festival at the Sandton Convention Centre, when a stranger jump-kicked him from behind.

Fortunately and perhaps unsurprisingly, despite being 71-years-old, Schwarzenegger was unfazed, writing on Twitter afterwards: ‘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. I’m just glad the idiot didn’t interrupt my Snapchat.’

Gold 104.3 Melbourne