Short video of Moy Yat Ving Tsun Kung Fu Chi Sao - 39 seconds of Grandmaster Moy Tung teaching on and demonstrating the role of elbows in Ving Tsun Chi Sao, as well as other techniques and details - see the centerline, form and technique control, the Ving Tsun horse, power and relaxation.

You have to build a relationship to even be able to work out with someone in Ving Tsun Kung Fu. If people don't know each other that means it's sparring. You're just trying to test each other's hands. Before we're even going to do things like play hands, or have some students enjoy working out and sparring with each other, let’s just make it so there's an environment where everyone is clear about the situation, and they know what they're getting into. And they make sure their kung fu's prepared for that. - Moy Tung