randomized study, single blinded,control group receive no intervention, no control with placebo, sample: war veterans with post traumatic stress disorder, inclusion criteria: outpatient war veterans with post traumatic stress disorder; patients who do not have psychotic symptoms, mood disorders, addiction,...; exclusion criteria:inpatient war veterans with post traumatic stress disorder; war veterans who do exercises regularly; patients who diagnosed as mood disorder, personality disorder, psychotic disorder and addiction,.. in addition to post traumatic stress disorder; inability in answeing the checklist; sample size:26, intervention:group aerobic exercise, duration of intervention: 12 2-session weeks, and each session, each session about 1 hour