Doug Stanhope is a standup comedian, author, and host of the Doug Stanhope Podcast. Check out his latest audiobook No Encore for the Donkey, available now as an Audible Original.

Marcus Luttrell is a retired Navy SEAL and recipient of the Navy Cross and Purple Heart. He is the author of "Lone Survivor", the basis for the 2013 film, and host of the Team Never Quit podcast.

Joe is joined by UFC Hall of Famer and actor Georges St-Pierre.

Dan Gable is a retired wrestler, coach, Olympic gold medalist, and recipient of the Presidential Medal of Freedom.

Tom Segura is a stand-up comedian, and co-host of "Your Mom's House" and "2 Bears, 1 Cave" podcasts. He is also the host of "Tom Segura en Español" a Spanish language podcast.

Brian Greene is a professor of physics and mathematics at Columbia University, and the author of several books. His latest, "Until the End of Time", is now available in paperback.

Lara Beitz is a standup comic known for her appearances on Comedy Central's "Lights Out with David Spade", Showtimes' "The Comedy Store" mini-series, and stages around the United States.

Alex Honnold is a professional adventure rock climber, author, and co-host, with Fitz Cahall, of the "Climbing Gold" podcast.

Eric Weinstein is a mathematician, economist, managing director at Thiel Capital, and host of "The Portal" podcast.

Mark Sisson is a fitness author, paleo diet expert, and retired elite athlete. His newest book is "Two Meals a Day: The simple, sustainable strategy to lose fat, reverse aging, & break free from diet frustration forever".

Action Bronson is a musician, chef, painter, and author. His book, "F*ck It, I'll Start Tomorrow: A True Story", is available now.

Ali Macofsky is a standup comedian and host of the Resting Bitch podcast.

Jack Carr is a New York Times bestselling author,  former Navy SEAL, and host of the Danger Close podcast. His newest novel, "The Devil's Hand", is available now.

Shanna Swan is an environmental epidemiologist whose work examines the impact of chemical exposure on reproductive health and child development. Her book, "Count Down", is available now.

Matty Matheson is a chef and author. He's the host of the YouTube series "Just A Dash" and co-host of the "Powerful Truth Angels" podcast.