Here's a chance for runners to tune up for the Standard Chartered Marathon to be held later this year. Sunday's Hong Kong 15km Challenge 2007 at scenic Pak Tam Chung Park in Sai Kung will be the final long-distance event before the marathon, which is scheduled for March. More than 2,200 athletes are due to compete in the challenge this year. With temperatures expected to be around 12 degrees Celsius that day, they are urged to do warm-up exercises before the race. Chan Kit-yee, champion of the women's senior category last year, said she would always do some stretching and other exercises before a race in order to prevent injuries. 'I will jog, as well as do some basic exercises, such as stretching and leg kicks. A bit of fast running before a race is also good,' said Chan, who has been taking part in long-distance events since 2005. Chan will also join the Standard Chartered Marathon's 10km race. 'I hope to beat my record times, which are 38:41 for 10km, 1:03:23 for 15km and 1:27:05 for half-marathons,' she said. She hopes to run a full marathon at the end of March in Xiamen . The men's defending champion, Gi Ka-man, and Chan Ka-ho are expected to battle for top honours on Sunday. Gi holds the best time for the event, while Chan is the Hong Kong 15km record holder. Leung Ying-suet, the women's 15km record holder, will be aiming to improve her personal best time. Christine Double has recorded the best time (one hour, 20 seconds in 2002) in the female category of the challenge. The race will start and finish at the park. The marathon is organised by the Hong Kong Amateur Athletic Association (HKAAA). This year, a new Team Category (men and women mixed) has been introduced. The individual categories include Junior (aged 16-19), Senior (20-34), Master 1 (35-44) and Master 2 (45 or above) for both men and women.