Daniele Bolelli is an Italian author, professor, and martial artist. His latest book "Not Afraid" (http://amzn.to/1SYRwpU) is out now and his new podcast called "History on Fire" is available on iTunes.

Phil Demers is a former Marineland employee turned truther, also known as the Walrus Whisperer. http://savesmooshi.com

Doug Stanhope is a stand-up comedian, writer, and TV host, also currently hosting his own podcast, The Doug Stanhope Shotclog Podcast. http://podcasts.joerogan.net

Ari Shaffir is a stand-up comedian and also hosts the podcasts Ari Shaffir’s Skeptic Tank & Punch Drunk Sports. The 2nd season of his show This Is Not Happening premieres on Comedy Central on February 23, 2016. http://arithegreat.com http:...

Doug Duren is a passionate hunter, farmer, land manager and conservationist. Nathan Ihde is also a farmer and conservationist living in Wisconsin.

Mark Sisson is a fitness author and blogger, and a former distance runner, triathlete and Ironman competitor. His latest book "Primal Endurance" is available now via Amazon.

Jocko Willink is an author, black belt in Brazilian jiu jitsu, and retired commander of the most highly decorated special-operations unit of the Iraq War: US Navy SEAL Team Three Task Unit Bruiser, which served in the 2006 Battle of Ramadi....

Joe is joined by Brendan Schaub, Ben Saunders & Eddie Bravo to watch the fights on Nov. 28, 2015.

Demetrious Johnson is a mixed martial artist. He is the first and current Flyweight Champion of the Ultimate Fighting Championship. http://www.twitch.tv/mightymouseufc125

Josh Olin is currently Vice President of Communications at 3D Realms, a video game publisher/developer. He also previously worked as the community manager for various games, including Call of Duty & League of Legends.

Eddie Bravo is a jiujitsu black belt, music producer, and author. http://www.eddiebravoinvitational.com/

Lance Armstrong is an American former professional road racing cyclist and 7-time winner of the Tour de France.

Remi Warren is a hunter, adventurer, and videographer. His show "Apex Predator" is on the Outdoor Channel and available at http://apexpredator.tv

Joe is joined by Brendan Schaub, Bryan Callen & Eddie Bravo to watch the fights on February 6, 2016.

Gary Laderman is a professor of American religious history and cultures At Emory University. He teaches and writes about death and dying, religion and sexuality, and sacred drugs. His most recent book is Don't Think About Death: A Memoir on...