PEOPLE Exclusive: Biggest Losers Then & NowAs the NBC weight-loss show celebrates its 10th year, see how some of your fan favorites have stayed slim. Catch season 16 Thursdays at 8 p.m. ET on NBC!

DANNI ALLEN

Then: The season 14 winner began her weight-loss journey at 258 lbs. before becoming known as "the girl on fire" and weighing in at 137 lbs. at the finale.
Now: The former marketing coordinator, 27, is a certified yoga instructor and opened up her own studio. "I do my best to eat clean: no processed foods or preservatives. I'm mindful of my portions and of course enjoy the occasional treat," says Allen, who weighs 155 lbs. and is training for a 36K run up a mountain in Costa Rica this November.