Amandla Stenberg

Actor, Singer & Activist Known for "The Hate U Give," "The Hunger Games" & "Everything, Everything"

Andre Agassi

Retired World No. 1 Tennis Player & International Tennis Hall of Famer; Olympic Gold Medalist, Entrepreneur & Philanthropist

Arnold Schwarzenegger

Actor, Producer, Director, Writer; California’s 38th Governor; Host of "Celebrity Apprentice"

Bill Maher

Political Satirist & Host of HBO's "Real Time"

Billie Jean King

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

Bret Michaels

Singer-Songwriter, Musician & Reality Television Personality

Brittany Snow

Actress, Producer, Director, Singer & Co-Founder of Love Is Louder

Brooke Shields

Actress; Model; Women's Health, Aging & Mental Wellness Advocate

Cynthia Nixon

Actress Known for her Role as Miranda Hobbes on HBO's "Sex and the City"; Former Candidate for Governor of New York

Deepak Chopra

Co-Founder of The Chopra Center for Wellbeing

Demi Lovato

Grammy Nominated Singer-Songwriter, Musician, Philanthropist & Mental Health Advocate

Gabrielle Union

Actress, Voice Artist, Activist, Author & Investor

Gretchen Rubin

New York Times Best-Selling Author of "The Happiness Project;" Host of Podcast "Happier with Gretchen Rubin"

Gretchen Rubin - Knowing Yourself: Why You're Happy and You ...

Hoda Kotb

Award-Winning Broadcast Journalist, Television Personality, Author & Co-Anchor of NBC News' TODAY

Ice-T

Rapper, Record Producer & Actor Known for "Law & Order: SVU"

Jane Lynch

Emmy Award-Winning Actress, Known for "Glee" and Hosting "Hollywood Game Night"

Jason Alexander

Actor, Writer & Director; Best Known for His Work on "Seinfeld"

Jay Leno

Emmy Award-Winning TV Late Night Show Host, Stand-Up Comedian & Best-Selling Author

Jessica Alba

Actress; Entrepreneur; Founder & CEO of The Honest Company

Jillian Michaels

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