Pippa Middleton competing in the grueling ÖTILLÖ Swimrun challenge

“It’s not for the faint-hearted,” Middleton told news agency Reuters (via the Toronto Sun), describing the hardcore race as “almost three Ironman swims and one and a half marathons.”

Princess Kate‘s younger sister, who turns 32 on Sunday, was not only inspired by the fitness element of the race but also by the beautiful scenery along the way.

“I was taken by the idea of competing in the stunning surroundings. Otillo has an edge to it that stands out above other endurance races,” she said. (Middleton will also be raising money for the Michael Matthew Foundation during the event.)

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Team 213 at addnature Sprintprice Pippa and Jöns

A photo posted by ÖTILLÖ Swimrun World Series (@otillorace) on Sep 7, 2015 at 1:39am PDT