Ali Vincent

First Female Winner of "The Biggest Loser"

Amy Robach

Co-Host of "Amy & T.J. Podcast"; Former Co-Host of "20/20" & Former ABC News Correspondent for "Good Morning America;" Breast Cancer Survivor

Bill Kurtis

TV Journalist, Producer, Narrator and News Anchor; Host of A&E's "Investigative Reports," "American Justice" and "Cold Case Files"

Claire Robinson

Known for "5 Ingredient Fix" on Food Network

Connie Merritt

National Healthcare Keynote Speaker, Award-Winning Author & Equine Therapy Advocate

Reigniting the Spark - Connie Merritt RN, BSN, PHN

Dan O'Brien

Olympic Gold Medalist & Decathlon Champion

Dara Torres

12x Olympic Medalist, NYT Bestselling Author, Entrepreneur & Healthcare Reform Advocate

David Zinczenko

Founder & CEO of Galvanized; Former Vice President of Men's Health, Women's Health & Prevention; Retired Nutrition & Wellness Editor at ABC News

Diane Rehm

Radio Talk-Show Host

Dr. Holly G. Atkinson

Award-Winning Medical Journalist

Dr. Will Miller

Educator, Psychotherapist, Author & Humorist; Authority on Stress & Coping; Ethics & Social Media Professor at Purdue University

Giuliana Rancic

Entertainment Journalist & Breast Cancer Survivor

Greg Louganis

4x Olympic Gold Medal Diver; LGBTQ Activist & Author

Jan Ping

Breast Cancer Survivor, Emmy Award-Winning Hair & Makeup Artist

Behind the Glam: Secrets from an Emmy-Winning Makeup Artist

Joan Lunden

Award-Winning Journalist, Best-Selling Author, Health & Wellness Advocate

Josh Peck

Actor & Social Media Influencer

Mark Ballas

Dancing with the Stars Champion & Mental Health Activist

Michelle Aguilar

Winner of NBC's "The Biggest Loser" Season 6, Author, Motivational Speaker

Murray Banks

Triathlon Champion / Motivator

Noah Galloway

U.S. Army Veteran, Amputee & Finalist on "Dancing With The Stars"