Giuliana Rancic

Entertainment Journalist & Breast Cancer Survivor

Lisa Leslie

WNBA Champion, Olympic Gold Medalist & Author of "Don't Let the Lipstick Fool You;" Coach of Ice-Cube's BIG3 Basketball League

Dominique Dawes

Three-time Olympian, Olympic Gold Medalist, Healthy Lifestyle Advocate and Gymnastics Academy Owner

Nastia Liukin

Olympic Gold Medal Gymnast

Amy Purdy

Former "Dancing with the Stars" Contestant & Paralympic Professional Snowboarder

Lisa Oz

Best-Selling Author, Producer, Host & Entrepreneur

Greg Louganis

4x Olympic Gold Medal Diver; LGBTQ Activist & Author

Derek Hough

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

Joan Lunden

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

Daphne Oz

Emmy Award-winning Television Host, New York Times Bestselling Author, Chef & Entrepreneur

Mark Ballas

Dancing with the Stars Champion & Mental Health Activist

Dr. Travis Stork

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

Chris Powell

Trainer and Transformation Specialist on ABC's "Extreme Makeover: Weight Loss Edition"

Marilu Henner

Actress, Producer & NY Times Bestselling Author

Bob Harper

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

Maintaining A Healthy Body & Mind | Bob Harper Q&A

Dara Torres

12x Olympic Medalist, NYT Bestselling Author, Entrepreneur & Healthcare Reform Advocate

Jennie Garth

Television Actress & Advocate for the American Heart Association

Joy Bauer

Nutrition and Health Expert on NBC's "Today Show" & Founder of Nourish Snacks

Dolvett Quince

Fitness Guru & Trainer from "The Biggest Loser"

Richard Simmons

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