Fitness kick

4:00 AM ET Fri, 28 Sept 2018

In 2008, Shannon and Heather Hudson thought of a way to expand their karate school. They created a kickboxing circuit with 9 stations where you spend 3 minutes at each. Today, 9Round’s 30-minute workout plan has grown to 740 franchised locations in the U.S. and abroad. We ask them who is getting fit the way fighters do, and what’s their next round.