Watch a sneak peek and check out photos of the upcoming episode of THE BIGGEST LOSER Season 10 Episode 12 which airs on Tuesday, December 7 at 8pm.
Episode Synopsis: THE FINAL FOUR CONTESTANTS FACE THEIR TOUGHEST CHALLENGE YET – RUNNING A MARATHON — WHILE BEING CHEERED ON BY FAMILY AND FRIENDS – The final four contestants leave the ranch and transition back to life at home, showing off their new slimmer selves to family and friends and facing the temptations and challenges of everyday life. Six weeks later, they return to the ranch to run 26.2 miles, cheered on by loved ones. The winner breaks a "Biggest Loser" marathon record. Then a final weigh-in determines who the two definite finalists will be – and which two contestants fall below the dreaded yellow line, leaving America to vote which one will be the third finalist to compete for the grand prize of $250,000. Alison Sweeney hosts, and trainers Bob Harper and Jillian Michaels also star.