Shannon Miller

Olympic Gold Medalist, Health Advocate & Cancer Survivor

Giuliana Rancic

Entertainment Journalist & Breast Cancer Survivor

Daniel Kraft, M.D.

Physician-Scientist; Founder of Exponential Medicine; Chair for Medicine & Neuroscience at Singularity University

Lisa Leslie

WNBA Champion, Olympic Gold Medalist & Author of "Don't Let the Lipstick Fool You;" Coach of Ice-Cube's BIG3 Basketball League

Ali Vincent

First Female Winner of "The Biggest Loser"

Joe Theismann

World Champion Quarterback, Broadcaster & Entrepreneur

Kyle Maynard

Inspirational Athlete, Author, Entrepreneur & Two-time ESPY Award Winner

Joan Lunden

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

Daphne Oz

Emmy Award-winning Television Host, New York Times Bestselling Author, Chef & Entrepreneur

Mark Ballas

Dancing with the Stars Champion & Mental Health Activist

Ian Morrison

Healthcare Futurist and Author

Dr. Travis Stork

Bestselling Author, Emergency Medicine Physician & TV Personality Known for "The Doctors"

Jim Abbott

Former One-Handed Major League Baseball Pitcher

Dr. Holly G. Atkinson

Award-Winning Medical Journalist

Dara Torres

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

Michael Strahan

Co-Host of "Good Morning America", "Fox NFL Sunday" Analyst, NFL Hall of Famer & Super Bowl Champion

Michael Strahan and his daughter Isabella, 19, reveal her brain cancer diagnosis in emo...

Dolvett Quince

Fitness Guru & Trainer from "The Biggest Loser"

Olivia Ward

Winner of "Biggest Loser" Season 11

Venus Williams

Professional Tennis Player, Four-Time Olympic Gold Medalist, Equal Pay Activist, Author & Entrepreneur

Tony Horton

Fitness Expert & Founder of Fitness Program P90X

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