callum ryan , 21 , will run eight marathons in each of australia 's states and territories between january and september this year .
callum is running to honour the memory of his late friend , malachy frawley .
malachy passed away when he was just 14 from a congenital heart disease .
callum wants to raise funds for heartkids australia and awareness of the impact of children 's heart disease .
he had never run a marathon before when he set himself the challenge .