ABC15.com (KNXV-TV)Orangetheory Fitness is a hot, new craze sweeping the ValleyABC15.com (KNXV-TV)Orangetheory Fitness www.orangetheoryfitness.com/>, the energizing group interval fitness concept with nearly 50 locations around the nation and six in Arizona, will launch its Six Week National Weight Loss Challenge on January 17, 2013. At the end of ...