Inclusion Criteria:  U.S. Military Veteran 18 years of age or older Diagnosis of PTSD as assessed by a score of >30 on the PTSD-Checklist Version 5 (PCL-5) Willing and able to attend testing and yoga sessions at the Athletic and Human Research Performance Center (AHPRC) on the campus of Marquette University Clear to participate in physical activity based on the Physical Activity Readiness Questionnaire (PARQ+)  Exclusion Criteria:  Currently pregnant or trying to become pregnant Positive score to one or more items on the PAR-Q+ without physician approval Already established regular use of yoga (i.e., more than one day per week)