Jackie does Segway-fu
A fairly interesting commentary from the Kungfu Cinema News and Review site.
But in the interests of correct information I have to point out that Jackie's first language is Mandarin (both his parents were from the mainland) and that is the language he grew up speaking. Tuition at the Opera School was also in Mandarin and learning the opera would also have involved memorising lyrics and speeches in classical Mandarin.
And unless my eyes are deceiving me watching the ad in slooooww mooootttiiioooonnn (sorry couldn't resist the temptation to do that) much of that is indeed Jackie and not a double. (He has a somewhat distinctive body shape).