Some discussion of the extreme power of controlling chi energy and the dantian.
I just hope Mod12 isn’t the Iron Neck exercise!
[youtube]http://www.youtube.com/watch?v=7qHL2PSpecI[/youtube]
Some ‘inside moving the outside’ and some forearm rotation to check out.
[youtube]http://www.youtube.com/watch?v=-232DNU8_TI[/youtube]
I always thought the golf swing power came from this. 
[youtube]http://www.youtube.com/watch?v=Aho3ZE0YrbA[/youtube]
Very good knee flex and pivot rotation! 
Great read this thread, just as I was thinking why hasn’t wing chun been mentioned and the above video is posted!
fantastic chi sao!