Nate Bargatze is a standup comedian and host of the "Nateland" podcast. His new comedy special, "The Greatest Average American", premieres March 18 on Netflix.

Tim Dillon is a standup comedian, actor, and host of the Tim Dillon Show.

Robert Bigelow is an aerospace entrepreneur and founder of the Bigelow Institute for Consciousness Studies: an organization supporting research into the survival of human consciousness after death.

Jamie Metzl is a futurist, author, and founder of OneShared.World.

Matt Fraser is a retired professional CrossFit athlete. He holds the distinction of being the most decorated competitor in the sport. He is the first and only person to win five CrossFit Games titles, winning the 2016, 2017, 2018, 2019, and...

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".

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

Jim Breuer is a standup comedian, actor, and host of the Jim Breuer Podcast. Catch him live on the "Freedom of Laughter" tour.

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

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

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.

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

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.

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.

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.