Inclusion Criteria:  Able to donate a small amount of blood, Planning to receive a booster dose of an mRNA-based Severe Acute Respiratory Distress Syndrome Coronavirus 2 vaccine, Between 18-70 years of age, Regularly participate in some form of exercise, including longer duration exercise sessions Can safely perform 90 minutes of light to moderate intensity exercise (walk, walk/jog, or jog) based on American College of Sports Medicine exercise participation guidelines  Exclusion Criteria:  Currently pregnant Presence of any conditions that could significantly impact the ability to exercise safely, or unable to receive the booster vaccine