Mark Spitz

Legendary Olympic Swimmer; Third Athlete to Win Nine Olympic Gold Medals

Mark Spitz on the 1972 Olympic Games in Munich

Jackie Joyner-Kersee

Olympic Legend, Philanthropist, American Record-Holder in the Long Jump & Founder of the Jackie Joyner-Kersee Foundation

Jillian Michaels

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

Joe Torre

Chief Baseball Officer for Major League Baseball; National Baseball Hall of Famer, 4-Time World Series Champion & 9-Time MLB All-Star

JP Pawliw-Fry

Co-Founder of the Institute for Health and Human Potential, Author & Columnist

Jane Lynch

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

Dr. Drew Pinsky

Physician, Addiction Medicine Specialist, TV Host, Author & Podcaster

Martina Navratilova

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

Paula Abdul

American Singer-Songwriter, Dancer, Choreographer & TV Personality

Tim Ferriss

Angel Investor & Author of "The 4-Hour Workweek"

Deborah Norville

Two-Time Emmy Award-Winning Journalist; Anchor of "Inside Edition" & Best-Selling Author

Jeffrey Pfeffer

Thomas D. Dee II Professor of Organizational Behavior at the Graduate School of Business, Stanford University

Andre Agassi

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

John Stossel

Emmy-Award Winning Journalist

Brittany Snow

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

Richard Simmons

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

Kathy Bates

Academy Award-Winning Actress; Cancer Survivor & Chairperson for the Lymphatic Education & Research Network

Ice-T

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

Kelly Osbourne

Fashion Designer, Singer & Actress; Former Contributor to E!'s "Fashion Police"; Daughter of Ozzy and Sharon Osbourne

Lily Tomlin

Actress & Comedian; Star of Netflix's "Grace and Frankie"