Liz and Jeff chat with Dr. Leonard Van Gelder, DPT, CSCS, TPS, CSMT about relational frame theory, the most empirically-studied theory of human language and cognition and how this relates to the psychological flexibility of patients' ability to incorporate new concepts into their existing stories, and prognosis for recovery. Leonard Van Gelder has been involved in the movement and rehabilitation field for over 15 years. During this time, he has studied, published research, and presented at regional and international conferences on the science of stretching, strength and conditioning, and therapeutic pain science interventions. He has explored a diverse spectrum of manual therapy and movement approaches, and emphasizes a biopsychosocial approach to manual therapy, movement, and education in his practice. He owns and practices clinically at Dynamic Movement and Recovery (DMR) in Grand Rapids, MI.    Links: www.dynamicprinciples.com www.dmrmove.com [email protected] @LizPeppin @JeffMooreDPT   Recommended resources: Learning RFT by Niklas Torneke ACT Made Simple by Russ Harris