Scottish GP Andrew Murray made it his mission to run seven ultra-marathons on seven continents in seven days.
It turns out he didn't meet that goal. He ended up doing it in just five days.
Dr Murray completed his epic journey with a 50-kilometre run in Sydney, a distance he has covered on every other continent since touching down in Antarctica five days ago.
From there he travelled to South America, then north to Atlanta, and across the Atlantic to London.
After a run around the pyramids of Egypt, he took a short flight to Dubai, and then a long flight to Sydney.
In total, he covered 41,000 kilometres in the air, and 3,500 kilometres on the ground.
It was all part of a campaign to draw attention to the importance of physical activity.
Just 30 minutes of exercise per day, Dr Murray says, can cut a person's chances of a premature death by 30 per cent.