Boundless

Simon and Turbo travel to Iceland to compete in the Fire and Ice Ultra, a 155-mile, seven-stage race across the country's beautiful but raw environment.

The conditions of the 250 km ultra run in Iceland vary from freezing gusts to sunshine. However, the finish line is reached and the celebrations are known.

Simon and Turbo brave 10-foot ocean swells on paddleboards as they cross the 32-mile Channel of Bones between the Hawaiian islands of Molokai and Oahu.

International competitors are pitted against local Kenyans in the Amazing Maasai Ultra, a 46-mile, single-day run.

A canoe race on the Fish river teaches that it is not important to win, but to participate. Flowing rapids, lack of experience and the instability of the canoe make the race impossible.

The 250km Sahara Race continues across the Faiyum region of the Egyptian Sahara Desert.