At least the CSC still has their videos up. I think someone about 50 pages or so ago was asking about the Sin The' clips. Click the "Grandmaster" link for Sin The' doing a preying mantis form (I think). Only the Hi-Speed links are working.
http://www.shao-lin.com/Category.cfm?CategoryID=13
I was looking for that other pic of Su Kong to sort of back up what TWS is saying. The one where he is shirtless. It's my understanding that picture is cropped to remove a bear biting Su Kong's arm, which would suggest a circus background.
As far as I know, Shaolin never used bears to train iron body.