Even if he is quite old, Ip Chun (93 years old) does Chi Sao with his much younger student. A Must see!
Ip Chun begun with Wing Chun when he was only 7 years old. He started to train with his father. However, nowadays he seems to keep up very well. It seems that 93 years can't stop him from doing what he's best at.
Most of all, he is a great example of how strength isn't primary in Wing Chun.