Pippa Middleton runs Kenya Marathon in 3:56:33

Photo credit: HELLO! magazine

Since making her debut as Maid of honour to The Duchess of Cambridge back in 2011, Catherine's little sister Pippa Middleton has been known to enjoy a challenge.

The socialite and party planner has tackled everything from sashaying down the aisle in front of two billion people to skiing marathons to cycling thousands of miles across the US for charity.

And now the author and columnist has discovered the best sport of all and ran her first 26.2 mile race, the Safaricom Marathon in Kenya.

Marathon running is one challenge you just can't fake and on June 27 Middleton proved her mettle, completing the 26.2-mile distance in a very respectable 3:56:33, placing 30th overall and coming seventh in the women's field. Middleton joined more than 1,200 other runners through the Lewa Wildlife Conservancy in Kenya.

'I decided that a marathon was a ‘life box’ that needed ticking and this year was my time—despite it being one of the toughest in the world, with temperatures rising to more than 30 degrees Celsius [86 degrees Fahrenheit], at an altitude of 5,550 feet and with the possibility of bumping into lions or rhinos,' Middleton wrote in a blog for HELLO! magazine.

'I was exhausted. My eyes welled up with tears,' Middleton wrote. 'Could I really manage this? I...thought of the schoolchildren, the rhinos, elephants and lions, the incredible Tusk projects—the reason I was doing this. It was tough, tougher than anything I’d been faced with before and required every inch of my energy, stamina and stubbornness.'

The charity event was organised by Tusk Trust, an organisation that protects wildlife, supports communities, and promotes education across Africa.