It is however, something of a test in your faith in physics. Think of baking bread. It is possible to open the oven and place your hand inside for a considerable time, despite the fact that the oven is perhaps 200 degrees Celsius. You can even briefly touch the bread, but you would quickly learn that it was a mistake if you were to touch the metal or ceramic container that the bread was in. The difference comes from the ability of various substances to conduct, or transfer heat.
Air is a very poor conductor of heat.
Bread is better, but not as good as metal which conducts heat with great efficiency. Wood does not conduct heat particularly well. The average human foot will happily be in contact with a glowing wood coal for about a second before sufficient heat is transferred to burn the flesh. The average step takes about half a second so for most people, so it is possible to take two steps with each foot before a dangerous amount of heat has built up. No one can walk on fire.