Staff

Paul Hasenyager

Paul H. Hasenyager, PT

Director
Paul is a native of Orange, CA and alumni of Orange Lutheran High School where he quarterbacked the football team and lettered in baseball. He graduated from California State University, Long Beach with a Bachelor of Science in Physical Therapy in 1986. Since then he has continued his education with numerous courses including The Back School of Atlanta, and various specialty studies in knee and shoulder rehabilitation. He founded and directed Champion Physical Therapy and Sportsmedicine, Inc. before selling his practice to a large national rehabilitation company. After spending the next ten years working with other clinics he decided to return to private practice to incorporate the best ideas of his years of experience into one clinic. In addition to working in Physical Therapy Paul spends his out of the office time training as a competitive road cyclist, working occasionally in the entertainment industry as an actor and and coaching youth baseball and soccer while residing in Orange, CA.

Derek Tsao

Derek Tsao, DPT

Derek was born and raised in Pasadena, California, and was introduced to the world of physical therapy after his own personal sports injuries as a high school athlete. Derek earned his Bachelors of Science in Applied Health and his Doctorate of Physical Therapy at Azusa Pacific University. While completing his undergrad studies, Derek worked in various physical therapy settings for several years as a physical therapy aide gaining valuable experience. After he graduated with his D.P.T., he chose to pursue his passion for orthopedic physical therapy at both ActivBody and Hoag Hospital Orthopedic Institute. As a young physical therapist, he loves the challenge of working in two very different, but enjoyable environments. On his days off from work, he loves to travel, work out, hike, and spend time with his beautiful wife and newborn daughter.

Chad Underwood

Chad Underwood, PTA

Chad Underwood was a student PTA intern at Activbody Physical Therapy as part of his education. We are happy to have him back after obtaining his Physical Therapist Assistant License and being in the field now since 2012. Growing up close by in Seal Beach, Chad has always been an avid jogger, hiker and body boarder that loves spending time at the beach. Chad at one time was going to school for psychology but switched to Physical Therapy due to the undeniable positive effect exercise has not only on the body but the mind.

Lejay Cantre, PTA

Lejay Cantre, PTA

Lejay received his Associate of Occupational Science Degree from American Career College. He worked as a Physical Therapist aide at an outpatient orthopedic clinic for 2 years prior to achieving his Physical Therapist Assistant license. As part of his curriculum, he was a student PTA intern at Activbody Physical Therapy and is now part of our rehabilitation team. Lejay's goal is to achieve a desirable outcome for his patients with the least possible discomfort so that they can go back to doing what they love. Growing up in Orange County, Lejay enjoys playing basketball and hiking.

Katherine Swailes

Katherine Swailes, PTA

Katie completed her Bachelor of Science in kinesiology at California State University Fullerton in 2006. She went on to complete her Certificate from Cerritos College Physical Therapist Assistant Program, and received her Physical Therapist Assistant License in 2008. Katie has worked as a PTA in the outpatient setting now for 8 years, and has experience with a number of orthopedic and soft tissue injuries both pre and post surgical. She specializes in manual therapy for cervical and lumber pain, get feels that a consistent stretching and strengthening exercise program is essential to decrease symptoms, improve function and reach your rehab goals. Katie’s goal is to eliminate pain, get patients back to their prior level of function and prevent further injury. She believes that the key to a successful rehabilitation program is communication, consistency, patience and safety. Katie is a wife and mother of two small children, and enjoys her days off being outdoors with her family. Katie has been a Huntington Beach Resident for 18 years and is proud to call Surf City her home.

Lita Holliday

Lita Holliday, PTA

Inspired by a passion to pursue a successful career in physical therapy, Lita earned her Bachelor of Science in Health Science & Exercise physiology from California State University Fullerton in 2017. She went on to complete her physical therapy assistant program in 2020 with Cum Laude Honors at Stanbridge University. She is exceedingly motivated to be involved with the positive effects and rewarding benefits of physical therapy to create valuable contributions to each individual's quality of life. Lita believes that movement is medicine and physical therapy is an outlet to achieve results to live a pain-free life, enabling those to pursue their passion and what they love to do. Outside of physical therapy, Lita enjoys dirt bike riding, hiking, river time with her family, early morning workouts, and exploring the outdoors.