Charcoal Heater to the Torso (CH-T) - The same charcoal heater as above will be used. The combustion chamber will be placed on the subject's anterior chest with a towel in between. The flexible ducts will be applied to the areas of high heat transfer i.e. over the shoulders, neck, and then anteriorly under the axillae to cross over the lower anterior chest. Participant will be breathing ambient air at room temperature (~22˚C).