Mike has raised some good points here. The both hands raised in the air very quickly is a very powerful technique that I've found leads very well straight into other techniques. I know from talking with my Sensei that the late master, Kenshiro Abbe Sensei emphasised this when he taught at the Hut. As Mike indicated, Bokken training is of immense value, emphasising correct posture, breathing, strengthening shoulders, wrists and arms. The other thing that Bokken training emphasises is the correct focused mindset of a warrior. There is a great picture of O'Sensei in posture holding a Bokken that says it all really.
All the best