Brief Exposure and Exercise for PTSD.

The goal of this clinical trial is to learn if 8 sessions of brief exposure and exercise therapy works to treat Post Traumatic Stress Disorder (PTSD) in adults. This study will also learn if participants think brief exposure and exercise therapy is a good and doable treatment. and The main questions it aims to answer are: * Do participants find brief exposure and exercise an acceptable and feasible means of treatment for PTSD? * Does brief exposure and exercise decreases of the severity of PTSD symptoms? Participants will: * Complete weekly questionnaires for 10-14 weeks. * Attend 8 twice weekly exposure therapy and exercise sessions for 4 weeks.