The season premiere kicks off with the contestants arriving at the ranch in teams of two, including mother/daughter, father/son, sisters, best friends, grandparents, cousins, an engaged couple and former models. Included among them are the series' oldest players yet (63-year-old grandparents), youngest male contestant (18), heaviest female contestant (379 lbs.) and heaviest contestant ever in the history of the show (454 lbs.). Alison Sweeney hosts and trainers Bob Harper and Jillian Michaels return to train the 11 couples who begin the show with a combined weight of more than 3.5 tons.