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.

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

Tom Papa is a comedian, actor, writer and television/radio host. Tom has a great story on "This Is Not Happening" here - http://youtu.be/487y7zJzkFM http://www.tompapa.com/ http://podcasts.joerogan.net

Carlos Condit is a mixed martial artist, competing in the welterweight division of the Ultimate Fighting Championship. Erwan Le Corre is the founder and innovator of a physical education system and lifestyle known as MovNat. http://podcasts...

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

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.

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:...

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....

Josh Zepps is the host of HuffPost Live & #WeThePeople LIVE available on iTunes (https://t.co/6eWfSu8tRM) and at http://wtplive.com

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

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

Peter Boghossian is a philosophy instructor, activist, author, speaker, and atheism advocate. He is a full-time faculty member at Portland State University.

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

Brendan Schaub is a mixed martial artist and also a former college & pro football player. Bryan Callen is an actor and stand-up comedian. Together they host "The Fighter & The Kid" podcast available on iTunes.

Bill Burr is a standup comedian and also hosts his own podcast called "The Monday Morning Podcast" His new show "F is for Family" premieres on Netflix on December 18th, 2015.