Exercise and Emotional Learning in Posttraumatic Stress Disorder

The goal of this clinical trial is to test how exercise affects learning and memory processes relevant to the treatment of PTSD. Participants will complete a baseline intake followed by two experimental sessions. During the first experimental session, participants will undergo an MRI session of imaginal exposure to traumatic memory cues followed by 30-minutes of moderate intensity exercise or low intensity exercise. Participants will complete a second session of imaginal exposure with MRI 24 hours later.

Inclusion Criteria: * Adults with PTSD related to interpersonal violence Exclusion Criteria: * Active or recent (within the last 3 months) severe substance use disorder(s) * Active or recent (within the last 3 months) suicidal, psychotic, or manic symptoms/ episodes * Significant developmental disabilities * Current daily benzodiazepine or stimulant use with inability to abstain for study sessions * Recent changes in psychiatric medication or trauma focused cognitive-behavioral therapy (CBT) (past 4-weeks) * Medical condition(s) that prohibit exercise * History of traumatic brain injury (TBI) with loss of consciousness \> 30 mins * Magnetic resonance imaging (MRI) contraindication(s) * Positive pregnancy test * History of seizure disorder * Spontaneous seizure(s) within the last 3 months