Mayim Bialik

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

Devin Alexander

New York Times Bestselling Author, Celebrity Chef Known For "Biggest Loser"

Bobby Flay

Chef & Host of "Throwdown With Bobby Flay" and "America's Next Great Restaurant"

Maria Menounos

CEO & Co-founder of AfterBuzz TV; Former E! News Co-Anchor; Best-selling Author, Journalist & Type-1 Diabetic

Shay Mitchell

Actress Known for Her Role in "Pretty Little Liars"; Entrepreneur & CEO of Beis

Jenny Slate

Actress, Comedian, Author & Creator of the "Marcel the Shell" Short Films; Known for "Parks & Recreation," "Big Mouth," & "The Secret Life of Pets"

Dan Savage

Advice Columnist & Host of the "Savage Lovecast" Podcast; LGBTQ Activist

Alice Waters

Executive Chef, Founder & Owner of Chez Panisse; Sustainable Agriculture Advocate

Keri Glassman

Nutritionist, Author, Founder and CEO of Nutritious Life

Art Smith

Celebrity Chef, Author & Humanitarian; Served as the Personal Chef of Oprah Winfrey

Rachael Ray

Chef, Cookbook Author & Television Host Known for the "Rachael Ray Show"

Laila Ali

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

Alex Newell

Grammy Award-Winning Actor & Singer Known for "Glee"

Gabrielle Bernstein

Founder of HerFuture.com & New-York Times Best-Selling Author

Lisa Oz

Best-Selling Author, Producer, Host & Entrepreneur

Soleil Moon Frye

Social Media Expert, Entrepreneur & Eco-Leader; Author of "Happy Chaos"; Alzheimer's Awareness Advocate

Katie Lee

Chef, Co-Host of Food Network's "The Kitchen" & Author of "The Comfort Table: Recipes For Everyday Occasions"

Terrence Jenkins

Actor and TV Host

Abby Wambach

6-Time U.S. Soccer Athlete of the Year; Two-Time Olympic Gold Medalist & FIFA Women's World Cup Champion; Pay Equity & LGBTQ Rights Activist

Diana Nyad

World Champion Swimmer, Storyteller, Sports Journalist & Broadcaster

Martina Navratilova

Retired World #1 Tennis Player, International Tennis Hall of Famer, Gay Rights Activist & Author

Jillian Michaels

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

Nastia Liukin

Olympic Gold Medal Gymnast

Ellie Krieger

Chef, Nutritionist, Best-Selling Author & Host of “Ellie’s Real Good Food”

Billie Jean King

Former World #1 Professional Tennis Player & Sports Icon; Advocate for Women's Equality

Liz Nead

Adventure Speaker, Author & Life Coach

Rainn Wilson

Actor Known for "The Office" & Creator of SoulPancake

Soul Boom: Why We Need a Spiritual Revolution

Tatanka Means

Native American Actor & Stand-Up Comedian

Danielle Bradbery

Country Singer; Season 4 Winner of NBC's "The Voice"

Michael Symon

Celebrity Chef & Food Network Personality

Michael Symon Gives Chefs The Ultimate Challenge In New Show