'In the weeks leading up to 29/04/08, I was running up to 60km a day and eating to a timetabled scheduled. I was disciplined.
'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.'
During his time on the show, Sam, then 19, lost a staggering 72kgs.
Last year, it had emerged the fireman had called off his wedding to girlfriend Daniella Schot after he was spotted on the dating app Bumble showing off his ripped physique.
It is believed the couple split in 2017.