For months, Kristin Ngai has been practising smiling while biting onto a chopstick at home, ensuring she shows six to eight teeth – the standard required to be one of the 75 volunteer prize presentation assistants from Hong Kong for the National Games this month. In addition to smiling, the 30-year-old bank clerk said they were also trained for three days to stand, sit and walk in specific ways, as they would be under the spotlight, helping with the presentation of medals as well as guiding...