Inclusion Criteria:  Males between the ages of 18-28 years Have been cleared to participate by the medical monitor for this study Must perform aerobic exercise for 150 minutes per week.  Exclusion Criteria:  Are a female  Have a history of adverse reaction to the cold environments, such as cold urticaria (i.e.  allergy to the cold) and/or Raynaud's phenomenon [disorder that causes decreased blood flow to peripheral body parts (e.g. fingers and toes)]  Identify any symptoms of COVID-19, which include:  Fever that exceeds 100.4F New loss of smell and/or taste Cough Shortness of breath/difficulty breathing Chills Muscle pain Fatigue Headache Sore throat Tested positive for COVID-19 within the past 6 months. Have a current musculoskeletal injury that would limit their physical activity or preclude the participant from walking, jogging, running, sprinting, or cutting. Chronic health problems that affect your ability to thermoregulate (disorders affecting the liver, kidneys or the ability to sweat normally). Other current illnesses at time of testing History of cardiovascular, metabolic, chronic respiratory disease, peripheral arterial disease, or coagulopathy. Currently taking a medication that is known to influence body temperature or blood flow (amphetamines, antihypertensives, anticholinergics, acetaminophen, diuretics, NSAIDs, aspirin, vasoactive medications) Currently smoking (cigarettes, vaporizers, e-cigarettes) Have a history of claustrophobia Have a history of allergic reactions to medical tape Hypothyroidism History of or current eating disorder(s) Are anemic