Inclusion Criteria:  Children between the ages of 6-11 years old Adults aged 18-65 Adults who have never smoked or have smoked less than 100 cigarettes in their lifetime  Exclusion Criteria:  Adults unable to consent Pregnant women Prisoners Cognitively impaired or Individuals with Impaired Decision-Making Capacity Individuals who are not able to clearly understand English Our research team does not have the resources required to translate our study materials or provide a translator for the study visit Any known cardiorespiratory condition (including but not limited to asthma, bronchitis, cystic fibrosis, congenital heart disease, and emphysema) Any known medical conditions that can be exacerbated by physical exercise (including but not limited to exercise-induced asthma, lower respiratory infections in the past 2 weeks, diabetes, hypertension, or epilepsy/seizure disorders) Any physical disability from a medical, orthopedic, or neuromuscular disorder that would interfere with the performance of physical activities Adult participants who are current or former smokers (i.e., an adult who has smoked 100 cigarettes in their lifetime and who currently smoke cigarettes, or an adult who has smoked 100 or more cigarettes in their lifetime) Inability to move the head from side to side or bend at the waist Inability to walk on a treadmill unassisted for the study duration Inability to tolerate wearing a mask while completing physical activities Anyone with symptoms of COVID-19 in the two weeks before their study visit Presence of an acute upper respiratory tract infection or symptomatic rhinitis (i.e., blocked nasal passages, runny nose, or significant sneezing) on the day of the study