(CNN) -- "My thighs cramping up on the very first day ... the mental trauma ... physical adversity ... I felt a great deal of fear wondering how I would make it through the next month," says Akshay Nanavati. The 30-year-old American businessman and former Marine is describing his 28-day run across Greenland in 2012, dragging a 190-pound sled. "Waking up, swallowing down the most disgusting freeze-dried food, packing up our tents and skiing for up to 12 hours a day in temperatures so cold that on some days my entire beard would be covered in ice. "This was my life for one month, except for the five days we were stuck in storms so powerful, the inside of our tent sounded like a washing machine."
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Akshay Nanavati plans to run across every country in the world
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He aims to complete around 20 countries by May 2015, with the whole project likely to take up to 20 years
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The toughest run will be the one crossing Israel and Jordan while Rwanda's run is his most anticipated trip
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Nanavati says meticulous planning, positive attitude towards fear and extra shoes will help to fulfill his mission
"I wrote my history thesis about the genocide and am very fascinated by the resilience of humanity displayed by the people in [@placeholder]," says Nanavati.