A group of people, some young, some old, stand in rows beside the National Aquatic Center (Water Cube) on Sunday morning. When the host says "please touch your left ear with your right hand", some of the older people hesitate for a while, before touching their right ear with their left hand.

This is one of several competitions at the fifth Entertainment Sports Meeting for the Visually Challenged. With the help of volunteers, contestants have to do the opposite of the hosts' instructions.

"I participated in all the five sports meetings. It's great fun. I can hang out with my friends and keep fit," says Yang Ruiyun, 49, who has been blind for more than a decade.