Derek Hough

Dancer, NYT Bestselling Author, Emmy Award Winner for Outstanding Choreography & Six-Time Champion of ABC's "Dancing with the Stars"

Bob Harper

Personal Trainer & Former Host of "The Biggest Loser;" Heart Attack Survivor

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Cheryl Burke

Professional Ballroom Dancer, Model, TV Host, Known for "Dancing with the Stars"

Mayim Bialik

Neuroscientist, Mental Health Advocate & Actress Known for "The Big Bang Theory"

Richard Simmons

Fitness Instructor, Actor, Video Producer Known for "Sweatin' to the Oldies" Aerobics Videos

Laila Ali

Undefeated Four-Time World Champion Boxer & Lifestyle Expert; Heart Disease Awareness Advocate

Ethan Zohn

Winner of "Survivor" Africa, 2x Cancer Survivor, Stem Cell Transplant Recipient, Social Entrepreneur, Philanthropist, Cancer Research Advocate, Former Pro Soccer Player, Sports Broadcaster & TV Personality

Jillian Michaels

Leading Fitness Expert, Certified Nutritionist, Renowned Life Coach & Powerful Entrepreneur

Dr. Mehmet Oz

Cardiothoracic Surgeon; Host of "The Dr. Oz Show;" Columbia University Professor & Author

Dr. Ian Smith

Doctor, New York Times Bestselling Author, Medical Contributor & Host of "The Doctors"

Joe Pantoliano

Emmy Award-Winning Actor & Film Producer; Mental Health Advocate

Greg Louganis

4x Olympic Gold Medal Diver; LGBTQ Activist & Author

Dave Navarro

Musician & Host of "Ink Master"; Best Known as a Member of Jane's Addiction & Former Member of Red Hot Chili Peppers

Dr. Holly G. Atkinson

Award-Winning Medical Journalist

Michael J. Fox

Actor, Author and Advocate; Founder, The Michael J. Fox Foundation for Parkinson’s Research

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Montel Williams

Emmy Award-Winning Talk Show Host; Multiple Sclerosis Survivor; Health Equity & Veteran Advocate

Dr. Travis Stork

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

Karina Smirnoff

Professional Dancer on "Dancing with the Stars" & Author of "We're Just Not That Into You: Dating Disasters from the Trenches"

Dr. Dean Ornish

Physician, Leading Researcher in Healthcare, Founder of the Preventive Medicine Research Institute & Bestselling Author

Caitlyn Jenner

TV Personality & Olympic Gold Medalist; Co-Host of "Keeping Up With Sports"

Richard Dreyfuss

Academy Award-Winning Actor

Jonathan Van Ness

Hair & Beauty Expert, Author, Television Personality; Known for Netflix's "Queer Eye"

Chrissy Teigen

Model, Author & Television Personality

Sharna Burgess

Professional Dancer on "Dancing With the Stars"

Giuliana Rancic

Entertainment Journalist & Breast Cancer Survivor

Sharon Stone

Award-Winning Actress, Producer, Activist & Humanitarian

Michael Phelps

Retired Professional Swimmer; Most Decorated Olympic Athlete in History

Judge Greg Mathis

Civil Rights Activist, Television Personality

Joan Lunden

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

Van Jones

CEO of REFORM Alliance, CNN host, Emmy Award-winning Producer & NY Times Best-Selling Author