[metallion]

Another interesting aspect of hitting a tyre that Ben does not talk about (and did not talk about when I was there) is that it seems anyone hitting even a lighter blow on a tyre will automatically straighten his left leg. It is visible on the video as well. Every time the guy is hitting the tyre he is straightening his left leg. He is straightening much less (or not at all) when he hits balls.

Maybe someone can explain or go deeper into this. I have not made that many observations, but so far they have been consistently as just described.