I weigh all of 50kgs.. Have since high school..
I am now 22 and still my weight won't budge
I do Muay Thai, but only have been for about 6 months or so.. It's fun as kicking shit.
Tried so many ways to gain some fat.. Even tried some of the myth diets, like drinking a pint of guiness after every meal.. That sucked ass..
Lol, I'm probably smaller than most 16 yr olds