Stewart Breeding, CPT

Stewart is S2’s Owimg_1455ner, and Chief Performance Officer. He is a Master level trainer with more than 25 years of expertise in the fitness industry. Stewart also integrates more than 30 years of martial arts, Yoga and meditation into his training approach. His passion for fitness started at age 15 when he won his first Youth National Powerlifting Championship and culminated as a combat veteran of the US Army 82nd Airborne Division. His personal achievements as an athlete and extensive knowledge of human movement and exercise science provide his clients an invaluable training experience. For the last ten years, Stewart has perfected his methodology for fat loss, muscle gain and sustainable weight loss. He has worked to create a results-driven, comprehensive system for success.

Stewart is an innovator and trendsetter, opening his first studio, Focus Fitness, in 2003. Focus was among the first boutique personal training studios in Nashville. Stewart has worked with professional athletes, special operations soldiers, artists of stage and screen as well as business executives and stay-at-home moms.Stewart has authored two books, Limitless (co-written with Dr. Tiffany Breeding) is a holistic wellness training program based on the theories of periodization, and Biohacker published in 2017 chronicles Stewart’s extensive fitness/strength training background and details the current science and program design used at StudiO2. Stewart’s methods involve a wide variety of physical modalities, accompanied with mental discipline, emotional awareness and resilience.



Certifications and Credentials:

  • Certified Personal Trainer, NASM
  • Performance Enhancement Specialist, NASM
  • Corrective Exercise Specialist, NASM
  • Level I USA Weight Lifting Sports Performance Coach
  • 2016 USAPL Raw Nationals Bronze Medal, Masters Division

tiffcollage_rvTiffany Breeding, PhD, CSCS

Dr. Tiff is the director of the S2 Nutrition Program and Chief Motivation Officer. She has been helping clients achieve sustainable performance enhancement and weight loss since 2005. She began her work as a Performance Psychology consultant for Division I student-athletes in Tennessee and Georgia, also consulting privately with PGA, NFL and PDL Soccer professionals. Dr. Tiff earned her Masters in Kinesiology/Performance Psychology from Georgia Southern (’05) and her PhD in Health and Human Performance from Middle Tennessee State (’08). Breeding is also a Certified Strength and Conditioning Specialist (NSCA) and Fitness Nutrition Specialist (NASM). She brings her unique combination of mental and physical performance training to StudiO2 offering clients nutrition counseling, metabolic restoration and performance coaching.

For the past 7 years, Tiffany has been providing corporate and executive performance to clients through worksite and employee wellness programming. Current and past clients include law practices, manufacturing companies, construction teams and most recently Denver Public Schools. She has presented at State conferences and workshops for Colorado PERA, Broomfield Soccer Club, Tennessee State Soccer, Nashville Metros Soccer, Baptist Sports Medicine, Tennessee Orthopedic Alliance, and TAHPERD. Dr. Breeding extends her passion for enhancing performance into the youth fitness arena as well. In 2010, she founded, FIZEEK! a non-profit youth fitness organization serving as an enhancement partner to Mayor Dean’s Nashville’s After Zone Alliance (NAZA). She also coaches middle soccer, and strength and conditioning.

Credentials and Certifications

  • PhD, Health and Human Performance (MTSU, ’08)
  • MS, Kinesiology/Performance Psychology (Georgia Southern, ’05)
  • BA, Psychology (University of Richmond, ’03)
  • Certified Strength and Conditioning Specialist, NSCA
  • Fitness Nutrition Specialist, NASM
  • National C Coaching License, USSF