Why do ushers put left hand behind back?

Ushers typically place their left hand behind their back as a sign of respect and professionalism. This gesture helps create a more polished appearance while assisting guests or directing them to their seats. Additionally, it allows the usher to maintain a more formal and attentive posture while interacting with patrons. Overall, this practice is a common protocol in many service-oriented industries to convey a sense of attentiveness and readiness to assist.