Ok I'm not 100% sure as to where this should be placed, but anyways...
I have studied Isshinryu for quite some time. One of the last kata's learned is sanchin, which I have always looked at as a primarily a conditioning/breathing kata since the breathing is emphasized, you tense up every muscle, often have someone striking you to test your stancework/how well you can take a punch all why doing the movements very slow and laboured. Basically I looked at it purely from an external MA standpoint.
As a result of an increased interest in bodymechanics and doing a lot of body conditioning exercises, I have tried doing shieldwork punching two different ways. A regular punch, and a punch with the same orientation as the arm in sanchin and found the sanchin punch to be more penetrating, it feels as though the triceps are a bit more tensed as a result on impact. I also noticed that the body mechanics were a bit similiar to what Upyu posted in his frontpage article on bodymechanics.
Maybe the uechi ryu guys do have a point about sanchin.
Anyone else play around or notice this.