Spartan race founder Joe De Sena on overcoming your biggest fears: 'In most cases, fear is fiction'

For Joe De Sena, business is "a combat sport."

De Sena, the 53-year-old founder and CEO of obstacle race franchise Spartan, has spent the past two decades leading corporate training exercises on his farm in Pittsfield, Vermont, for companies including Nike, Google and Goldman Sachs.

Now, he's the host of CNBC's new primetime series, "No Retreat: Business Bootcamp," which premieres Tuesday, March 8, at 10 p.m. ET. On the show, business owners from across the country bring their employees to De Sena's farm, where he puts them through a series of challenging physical and mental tasks meant to improve teamwork, communication and leadership skills.