Bret Contreras was born and raised in Phoenix, Arizona. Contreras received a bachelor’s degree from Northern Arizona University and a master’s degree from Arizona State University. Currently, Contreras is pursuing a PhD in Sport Science from Auckland University of Technology in New Zealand. Contreras is a Certified Strength and Conditioning Specialist with the National Strength and Conditioning Association and maintains a popular blog at BretContreras.com. Known as “The Glute Guy” in strength & conditioning circles, Contreras has turbo-charged the fitness industry by conducting scientific analyses of various exercises and methods, introducing effective new glute exercises, and relentlessly pursuing his quest to discover the optimal glute strengthening and shaping routines.
Kellie Davis is a freelance writer and blogger turned fitness coach living in Northern California. She published short fiction and essays in anthologies and literary magazines before starting a full time career as a health and fitness writer. She currently works as a contributing author to several online fitness publications and corporate blogs. In addition to writing, Davis helps women all over the world achieve optimum health as a fitness and nutrition coach.