FitWit Team

Josh Guerrieri, President
General Manager FitWit Decatur/Kirkwood


Certified with the American Council on Exercise (ACE), Josh has been training clients since 2005.  He brings not only knowledge of personal fitness and exercise, but also a strong athletic background that serves as a foundation for his instruction. Josh was a two-sport athlete in college, playing basketball and track & field, and a three-time conference champion in the decathlon, setting both school and conference records.
When not helping lead FitWit Nation, Josh and his wife Erin are off ‘living the dream’ with their 5 kids!

Benjamin Thoele, Vice President



After separating from the Air Force in 2007, Ben moved to the Atlanta area to help found The FitWit Foundation with his good friends Josh and Erin Guerrieri. Ben sees fitness as one of the only things in life where you can succeed just by trying. You don’t have to be good at it–you just have to try. Ben is a Certified Strength and Conditioning Coach with the National Strength and Conditioning Association and a CrossFit Level I certified trainer. Ben earned a MS in Operations Research from the Air Force Institute of technology and played NCAA Division III football and track at Wittenberg University

Location Head Trainers

Stacy Sax, General Manager FitWit Old Fourth Ward


Stacy joined FitWit in January 2008 as a camper.  She grew up playing softball and basketball but was primarily a runner before joining FitWit.  Stacy credits FitWit for allowing her to reach a much higher fitness level.  Stacy joined the FitWit team as an assistant trainer at the Grant Park location before taking the role as lead trainer of Decatur FitWit in November 2009.  Stacy also works part-time as an attorney at the Atlanta Legal Aid Society.  In this role, she provides free civil legal assistance to low-income individuals and families. Stacy is a certified personal trainer through the American Council on Exercise (ACE).  She is also CrossFit Level 1 certified and received her Russian Kettlebell certification (RKC) in September 2011.  In addition to running local 5k races, she also has run a few half marathons and, more recently, has been participating in sprint triathlons.

Casey Rush, Head Trainer FitWit Old Fourth Ward


Casey started his sports and fitness journey as soon as he could stand on two feet. Always staying active as a child, he tried every sport he could, from tennis and baseball to soccer and basketball. As a high school athlete, Casey started his varsity playing career early as a freshman soccer player, followed by starting on the football team his sophomore year, and basketball his junior year, earning letters in all three sports. After high school, he joined the Valdosta State Blazers football team, and continued his love for all sports on club and intermural teams at Valdosta State. Upon moving back to Atlanta, Casey started coaching middle school football at Kell High School. After three years of coaching, he decided to combine his passion for fitness with his love for coaching, and began personal training. After six months of training friends and family, Casey decided to follow his heart and get his ACE (American Council on Exercise) certification to become a full-time personal trainer. He gained experience in one-on-one training sessions, and was introduced to group training by leading the Etowah High School basketball team through their summer workouts. After gaining interest in group training, Casey joined the FitWit family in the Spring of 2012. The family atmosphere and competitive environment was a great place for him to call home, and continue spreading his passion for health and fitness.

Kathryn Taylor, FitWit Studio Manager


Kathryn Taylor brings a wealth of FitWit experience and knowledge to the role.  Kathryn has been a FitWitter since 2010 and became a trainer in 2013.  She finished Ironman Arizona in 2012 and is an ACE Certified Personal Trainer.  Kathryn has completed the Russian Kettlebell Challenge course and is also a swim coach for the Atlanta Tri Club.

 Assistant Trainers

Will Negus


Matt Beerse


Cassi Niemann


Jessie Marus


Robert Paschka


Ginger Powell


Jenn Purdy

Nutrition Coach