André Wiersig is not your average swimmer who just goes to his local swimming pool. This is a man who likes to push the boundaries of what is humanly possible, swimming out in the open seas without any protection from the cold.

In this part, we find out how it all began and why extreme swimming is not the way to go if you are mainly interested in exercising to look good.

How does André Wiersig prepare for the cold? How did he get into the game in the first place? Watch this clip to find out.

André Wiersig has had some brushes with death in his time. He tells us about his experiences and the peaceful relationship he has with the other species that swim with him in the ocean.

Strength training is also part of André Wiersig's preparation for his aquatic challenges. That can sometimes be quite painful... This extreme swimmer tells us how he manages to keep the pain at bay.

André Wiersig is aware that most people think he is crazy, but for him, crossing the straits and swimming in the ocean is much more than just an athletic challenge.

André Wiersig has become an ambassador for the seas and shares his experiences in talks—he sees this as his purpose on earth. Now he has swum across all seven straits, the last one being the Strait of Gibraltar. What will be his next challenge?