Jessie Pavelka

Fitness Expert; Former Television Host on NBC’s "The Biggest Loser"

Kacy Catanzaro

Gymnast, First Woman to Qualify for Television Show "American Ninja Warrior"

Matt McGorry

Actor Known for "Orange is the New Black" & "How to Get Away with Murder;" Feminist & Social Change Advocate

Witney Carson

Emmy-Nominated Professional Dancer Known for "Dancing With the Stars" & "So You Think You Can Dance"; Blogger & Influencer

Camila Alves

Model, Designer & Entrepreneur

Rachel Frederickson

Winner of "The Biggest Loser" Season 15

Chrissy Teigen

Model, Television Personality, Entrepreneur & Cookbook Author Known for "Cravings" Series; Women's Rights Advocate

Q Parker

Grammy Award-Winning Singer-Songwriter & Co-Founder of Multi-Platinum Group 112; Founder, The Q Parker Legacy Foundation

Q Parker | In The Spotlight | Full Interview

Dave deBronkart

Patient Engagement Advocate, Author, Survived Stage IV Kidney Cancer

Larysa Didio

Celebrity consultant in nutrition and healthful living.

Lance Secretan

Leadership Expert, Best-Selling Author, Former CEO

Elizabeth Cohen

Senior Correspondent for the CNN Health, Medical, & Wellness Unit

Mark Wahlberg

Actor, Producer Known for "The Departed," "Ted" & "Shooter"; Chief Brand Officer, F45 Training; Philanthropist & Founder, The Mark Wahlberg Youth Foundation

Tracy Anderson

Fitness Pioneer, Entrepreneur & Author, Founder of The Tracy Anderson Method

Kris Jenner

Media Personality, Producer, & Entrepreneur; CEO of Jenner Communications; Known for "The Kardashians"

Raj Patel

Award-Winning Author, Filmmaker, Research Professor

Alison Sweeney

Actress & TV Personality Known for "Days of Our Lives" & "The Biggest Loser"

J.D. Kleinke

Medical Economist, Former Healthcare Executive & Author; Thought Leader and Pioneer in Healthcare Informatics

Jenny Evans

Stress Resiliency Expert, Speaker; Author & Enterprising Women of the Year Award Winner

From A Lost Elephant to A Lost Soul: The Gritty Journey of Self-Discovery

Ethan Zohn

Winner of "Survivor: Africa"; Cancer Research Advocate; Former Pro Soccer Player; 2X Cancer Survivor & Stem Cell Recipient