Phil and Amy Parham, authors of The 90-Day Fitness Challenge and The 90-Day Fitness Challenge DVD, were contestants on Season 6 of NBC’ s The Biggest Loser. Over a seven-month period, they recorded the highest percentage of weight loss of any couple in the program’ s history. Married for more than 20 years, Phil and Amy live in South Carolina with their three boys, Austin, Pearson, and Rhett.