Description:The star of Chinese track and field, Liu Xiang, finally arrived in London on Friday after finishing his training camp in Germany. The 2004 Olympic champion had opted to stay in Leverkusen to prepare for the 110m men's hurdles competition, claiming the climate was better. However, Liu's coach, Sun Haiping, has revealed the cold conditions in Germany meant the 29-year-old's foot injury flared up at times, causing the coach some concern.(1:33)