Bowing Boy

Went to a supermarket yesterday filled with hundreds of people. At the entrance to the market was a young boy who would give a bow (45 degree) as each person walked in. Gosh this guy must get worn out bowing like that all day long. Bowing for hundreds of people possibly thousands daily seems much more difficult than the Thai custom of waing people at the door of a restaurant or after a purchase. A tough gig!