The Team

sleeping tiger fitness owner operator trainer coach

Nathan Zimmerman MS, CSCS, USAW, SFG

Owner and Operator

Nathan is a certified Strength and Conditioning Specialist through the NSCA, a certified level 2 Sports Performance Coach through USA Weightlifting, and a certified a Strong First Girya Instructor. He holds a MS in Kinesiology from Cal Poly, SLO. Nathan assisted at a SFG(certification) for the first time in November, 2015. His experience includes working as a physical therapy aide at the Body and Balance Center in San Luis Obispo and as a volunteer aide at Bell Trace in Bloomington, Indiana. At Bell Trace, he treated shoulder, knee, hip, and back injuries. Nathan also had the privilege of interning at Athlon Elite under Ryan Joiner. Since then he has gained experience in the fitness field through working at the Cal Poly Rec Center as a personal trainer, as well as helping with strength and conditioning for a local kickboxing team. Nathan has trained with and learned from the likes of well known and influential trainers in the strength and conditioning community including Dan John, Pavel Tsatsouline, Doug Nepodal, Brett Jones, Jeff O’Connor, Max Shank, Kelly Starrett and David Whitley.


Cofounder and Operator

KT is a Cal Poly graduate with a MS and BS in Kinesiology, a certified Strength and Conditioning Specialist, a certified level 2 Sports Performance Coach through USA Weightlifting, and a certified StrongFirst Girya Instructor. In her undergrad she worked with Dr. Hagobian as a research assistant examining exercise’s effect on appetite hormones, resulting in KT becoming a published co-author for the study. Additionally she was an assistant coach for SLO High School’s shot put and discus throwers from 2009 to 2011. As a graduate student, KT taught undergraduate exercise physiology and biomechanics labs while conducting her thesis comparing different strength training program designs. In addition to her position at STF, KT is a part-time lecturer at Cal Poly in the Kinesiology department, and Mission Prep’s Strength Coach.

Coach Darby USA Boxing, UKA

Boxing and Kickboxing Coach

Coach Darby is an accomplished and diverse martial artist who has trained in traditional Boxing techniques, Khmer Boxing and Muay Thai.  Darby has studied martial arts for over 30 years and has been teaching for the past eighteen years. He specializes in Boxing, Khmer Boxing and Muay Thai.  Darby started his boxing education in 1977  in the School of Hard Knocks and has continued to learn ever since.