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Pippa Middleton, the sister of Britain's Catherine, Duchess of Cambridge, watches the women's singles tennis match between Angelique Kerber of Germany and Heather Watson of Britain at the Wimbledon Tennis Championships, in centre court, London June 26, 2014. REUTERS/Max Rossi

Pippa Middleton has proven that she’s not only a tough athlete, she also has a big heart. A week after completing a 54-mile charity bike ride alongside brother James, this fitness enthusiast ran in a marathon for the conservation charity Tusk Trust.

Last Saturday Kate Middleton’s sister participated in the annual Safaricom Marathon held at the Lewa Wildlife Conservancy in Kenya, Africa. The marathon was a fundraising event, organized by Tusk Trust and Lewa, and supported by Safaricom. According to People, Pippa completed the 26.2 mile-run, which goes through the Lewa Conservatory.

The race is considered one of the toughest marathons in the world, given the scorching heat and the high-altitude air at more than 5,000 feet.

A spokeswoman at Tusk told People: "We are absolutely delighted to have her support. Pippa ran exceptionally well in a very tough marathon, wearing the Tusk cap."

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