Sabrena Jo, Ph.D., has been actively involved in the fitness industry since 1987. As an ACE-certified group fitness instructor, personal trainer, and health coach, she has taught group exercise and owned her own personal-training and health-coaching businesses. Jo is a former full-time faculty member in the Kinesiology and Physical Education Department at California State University, Long Beach. She has a bachelor's degree in exercise science as well as a master's degree in physical education/biomechanics from the University of Kansas and is currently pursuing her PhD in Exercise Psychology. Jo is a relentless pursuer of finding ways to help people start and stick with physical activity.