Is a person warmed by fire an example of endothermic reaction?
I wouldn't call it an endothermic chemical reaction. The fire is an example of an exothermic reaction. The man constitutes part of the surroundings for the fire (the system), and heat is being transferred between the system and its surroundings. Looking at it the opposite way, the fire could be considered the surroundings (a heat reservoir) for the man (the system), and there is heat being transferred from the surroundings to the system. But the man is not undergoing a chemical reaction.