Things that came to mind is that there is ballistic "type" stretching. It does not actually have to ballistic but is done that (not by me
). Toes your toes... instructor: 1,2,3,4 - class 5,6,7,8, and everyone is bobbing for apples.
The "hurdler's stretch" is another high risk stretch that come to mind (though we don't do them- but I have seen them quite a bit in MA warm ups...
When have one sensei who is a stretching specialist and we never do that when that person is doing the warm up / stretch. (one key difference in our approach is that we do the stretching after warm up and it is more of the warm than actual streching. (we are expected to look after our on flexibility. I think the instructors feel that they have to do the "old" kihon" stretching routines...