Taufatofua lost 15kg as he adapted his body and learned a new sport, and is now able to compete in the Winter Olympics.
He made his name after finding recognition as the oiled flagbearer for Tonga at the Rio Olympics in 2016.
The 34-year-old crashed out in the first Round at Rio, but has spoken of his pride at being able to compete again:
"After Rio I decided to find the hardest sport possible because I needed a new challenge.
"You've got to put your body through something really challenging and the goal was to do it in one year - and we did it in one year!"