瞬間連写アクションポーズ―立ち回り・スタント・アクロバット [単行本]Real Action Pose Collection
A beautiful reference book. I bought mine from Kinokinuya when I was living in California.
They have published three books so far, the 2nd one is focusing on sword action and the third one has a female as the main fighter. I own the swords one and will be looking for the third book at SDCC.