student will push his body to the limit , running a marathon in each of australia 's eight states and territories to honour the memory of his late , treasured childhood friend .
although he had never run a marathon before , callum ryan , 21 , committed himself to the daunting challenge of running eight of them between january and september 2015 - covering a total distance of 337.5 kilometres .
malachy frawley who died from heart disease in 2013 when he was just 14 years old .