There are many people who have built empires but not many in the field of fitness. One stand out is Joe de Sena, the starter of the Spartan Race. This race combines mud, obstacles and other items to show your power and ability to handle endurance over time and at $100 a pop for over a million people, you can see the appeal. Others on this list include the founder of Zumbo, Tae Bo and one of the main experts on TV’s “The Biggest Loser,” Jillian Michaels.
Read more: 6 Entrepreneurs Who Built Fitness Empires
