Mark Ballas

Dancing with the Stars Champion & Mental Health Activist

Cheryl Burke

Professional Ballroom Dancer, Model, TV Host, Known for "Dancing with the Stars"

Dan Savage

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

Bob Harper

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

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

Jillian Michaels

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

Julianne Hough

Emmy Award Winner for Outstanding Choreography, Country Music Singer, Actress & Professional Dancer

Matt McGorry

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

Bethany Mota

YouTube Sensation Known for her Fashion, Beauty & DIY Tips; "Dancing with the Stars" Season 19 Contestant

Troian Bellisario

Stars as Spencer Hastings in the ABC Family Series "Pretty Little Liars"

Andy Cohen

Emmy Award-Winning Host & Producer of Bravo’s "Watch What Happens: Live"

Andy Cohen reacts to his infamous New Year’s Eve rant

Richard Simmons

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

Taraji P. Henson

Academy Award-Nominated Actress & Mental Health Advocate

Laila Ali

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

Shay Mitchell

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

Joe Manganiello

Actor & Filmmaker; Known for his Roles in "True Blood" and "Magic Mike"

Dr. Mehmet Oz

Cardiothoracic Surgeon; Host of "The Dr. Oz Show;" Columbia University Professor & Author

Dr. Ian Smith

Doctor, New York Times Bestselling Author, Medical Contributor & Host of "The Doctors"

Karina Smirnoff

Professional Dancer on "Dancing with the Stars" & Author of "We're Just Not That Into You: Dating Disasters from the Trenches"

Tony Dovolani

Professional Ballroom Dancer, "Dancing with the Stars" Personality

Rocco DiSpirito

James Beard Award-Winning Chef, Healthy Lifestyle Advocate & New York Times Bestselling Author

Drew Learns Chef Rocco Dispirito's 5-Minute Shrimp Dish

Jonathan Van Ness

Hair & Beauty Expert, Author, Television Personality; Known for Netflix's "Queer Eye"

David Zinczenko

Founder & CEO of Galvanized; Former Vice President of Men's Health, Women's Health & Prevention; Retired Nutrition & Wellness Editor at ABC News

Chrissy Teigen

Model, Author & Television Personality

Alex Newell

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

Dylan O’Brien

Actor Known for his Role in "The Maze Runner" and MTV's "Teen Wolf"

Nev Schulman

Producer, Actor, Photographer & TV Host Known for MTV's "Catfish: The TV Show"

Mayim Bialik

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

Peta Murgatroyd

Professional Dancer on "Dancing with the Stars"

Tegan & Sara

Canadian Pop Duo

Daphne Oz

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