Bill Germanakos
After dropping more than 100 pounds during the course of several months, the season-four winner began teaching spin classes during his free time.
Allen Smith
The firefighter dropped a staggering 116 pounds during his run on the show. That tallied up to 35 percent of his total body weight.
Rebecca Meyer
She took home $100,000 for going home almost half her size. Rebecca lost 139 pounds during her journey on the competition show.
Michelle Aguilar
Starting season six off at 242 pounds, Michelle got down to 132 within a surprisingly short amount of time.
Danny Cahill
He clocked in at 430 pounds on season eight, and was under 200 pounds shortly before the show finished.
Olivia Ward
Olivia went from 261 to 132 pounds on season 11 of the hit NBC program.
Hannah Ward
Like her twin sister, Hannah's progress was major. She lost 120 pounds while on the show.
Abby Rike
After the death of her husband, infant son and young daughter in a car accident, Rike decided to make a dramatic change. She lost 100 pounds total, almost half of her body weight.
Shay Sorrells
Starting on season eight as the biggest contestant the show had ever seen wasn't easy, but she managed to lose an impressive 172 pounds.
Danni Allen
During season 14, Jillian Michaels' beloved contestant began her journey on the show at 258 pounds. She would weigh in at 137 pounds on finale night
Rachel Frederickson
The 24-year-old dropped from 260 pounds down to 105, losing almost 60 percent of her body weight.