A couple years ago I visited my brother in Shanghai, he was there for work for about a year.
He said something to me about seeing the Chinese people "hitting trees", but I didn't really know what he was talking about...
Well, a few days later I was walking...and there were 3 older Chinese women (I'd guess in their 60's)...they were standing around a tree and kind of "body checking" it...taking turns...just over and over again they would crash their whole body (not too hard--they wouldn't injure themselves or anything!) into the tree!
http://www.theworldofchinese.com/2010/05/fighting-with-trees/
That and another day, I was trying to get somewhere and I got lost...I ended up on a street corner, where about a dozen couples were dancing. This was probably around 9 or 10 am on a weekday.
Like this
http://www.youtube.com/watch?v=R4ZY9A1RGdg (not my video, just one I found)