Inclusion Criteria:  self-reported exposure to a traumatic event persistent (> 1 month) PTSD-related symptoms adequate to screen positive for PTSD or self-reported history of a prior PTSD diagnosed by a health care professional. poor sleep quality (Pittsburgh Sleep Quality Index >5) failure to meet recommended level of aerobic or resistance training. Physical activity for U.S. adults (<150-mins of moderate or 75-mins of vigorous physical activity [or a combination] per week and/or < 2 days a week of resistance training targeting the major muscle groups). able to safely perform high-intensity exercise aged 18-39 years non-smoker willing to avoid alcohol and vigorous physical activity 24 hours before visiting the lab willing to avoid caffeine for 12 hours before visiting the lab  Exclusion Criteria:  Pregnant, lactating, or plans to become pregnant over the next 2 months. Individuals who started taking medication for anxiety or depression-related symptoms within the last month. Individuals currently taking beta-blockers or other medications/substances (marijuana and other illegal drugs) that impact heart rate. History of reproductive disorders (e.g., premenstrual dysphoric disorder or polycystic ovary syndrome), cardiovascular (e.g., cardiac arrhythmia), or pulmonary disorders (e.g., asthma). Pain intensity of 8 or greater in the thigh or foot in the past month Probable alcohol use disorder