Great video thanks for sharing. The Bryans might have gotten it from the Red Hit Chili Peppers Higher Ground video, which is from the late 80s. Or the Peppers got it from the Bryans. It's one or the other.
Cool to hear that Venus initiated the chest thump at Wimbledon ) Never would have thought that as V is usually all business out there.
"He looked like he was trying to imitate Sampras when I first played him." Agassi in Facing Federer