"In the weeks leading up to 29/04/08, I was running up to 60km a day and eating to a timetabled schedule. I was disciplined," he wrote of his time on The Biggest Loser.
"I proved to myself that I could do what I put my mind to. I still face demons and challenges but this day empowered me realising my worth and self empowerment.
"I hope that everyone has that opportunity to reflect on themselves, and realise how amazing they are, what they can achieve and what they are worth," he finished.
During his stint on the weight loss programme, Sam lost 72kgs.
Rouen entered the show at a staggering 154 kilograms, before shedding 71 kilograms during the series to become the first Biggest Loser in Australia at the young age of 19.
And since his 2008 transformation, Sam has not only kept the weight off - he went on to become a smoking hot Sydney fireman!