How Does Santa Get Down Those Chimney

How does santa get down those chimney Have you wonder how santa gets down those chimneys. With those chimney being small how does get though them all Does he fit down them well or does he have to turn small. Is he really magic and turn thin? How does he get into the houses that have no chimney? Does he come through a door or makes a magic hole in the wall? Does he use the front door or does he go through the back. With him being so fat and having a big sack how does he get down that chimney Nobody knows but him.