David Zinczenko

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

Tony Horton

Fitness Expert & Founder of Fitness Program P90X

Crush It!: The Revolutionary Fitness Plan for All Levels That Burns Fat, Builds Muscle,...

Rich Froning

CrossFit Athlete, Coach & Christian Speaker

Ali Vincent

First Female Winner of "The Biggest Loser"

Tommy Caldwell & Kevin Jorgeson

Legendary Climbers of El Capitan

Dr. Holly G. Atkinson

Award-Winning Medical Journalist

Dolvett Quince

Fitness Guru & Trainer from "The Biggest Loser"

Dara Torres

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

Mark Ballas

Dancing with the Stars Champion & Mental Health Activist

Dr. Lisa Masterson

OB/GYN, Mom, Philanthropist & Author; Known as Co-Host of "The Doctors"

Noah Galloway

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

Joe Theismann

World Champion Quarterback, Broadcaster & Entrepreneur

Ozzie Smith

15-Time MLB All-Star & National Baseball Hall of Fame Inductee; Former Shortstop for the San Diego Padres & St. Louis Cardinals

Shannon Miller

Olympic Gold Medalist, Health Advocate & Cancer Survivor

Darcy Winslow

Former Nike Global Sustainability Guru and Managing Partner at The Academy for Systemic Change

Joan Lunden

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

Giuliana Rancic

Entertainment Journalist & Breast Cancer Survivor

Jennifer Siebel Newsom

First Lady of California; Actress & Filmmaker of "Miss Representation" and "The Mask You Live In"

Murray Banks

Triathlon Champion / Motivator

Greg Louganis

4x Olympic Gold Medal Diver; LGBTQ Activist & Author