Chinese hurdles star Liu Xiang flew to Los Angeles on Monday for a half-month winter training course.
The 27-year-old Shanghai native will also receive a physical check-up during his brief stay in the United States.
Liu, who withdrew from the 2008 Beijing Olympics due to an Achilles' tendon injury, made an impressive comeback in 2010 as he claimed his third successive Asian Games title in the 110m hurdles.