There are some people who go bungee jumping or white water rafting for kicks.
And then there are those people who get their adrenalin fix by scaling a 500ft cliff - without any safety equipment whatsoever.
Mich Kemeter, 23, who's become known as the Human Fly, climbed the monster cliff in the Verdon National Park in France.
The thrill-seeker is a world expert in free climbing, which pretty much is at it sounds - a sport where people scale heights without any equipment like ropes and harnesses.
Adventure photographer Alexandre Buisse took the amazing photos as part of his job travelling the world to record extreme athletes performing their craft.
Alessandre told The Sun: "For the shot where Mich is on the 500ft cliff we had to abseil down the rock face for about 30 metres, or 100 feet, and then Mich removes the ropes.
"He then has to climb back up again himself while I am above taking the pictures. Of course the biggest thing for me is not distracting Mich, I don't want him to fall.
"Mich is a free solo climber and one of the best in the world. In some of the photographs you can see he is wearing a backpack, that actually contains a parachute which he can use if he does fall off, just like Mission Impossible really."
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See all the pics of Mich's amazing climb below: