The Body Strike means to approach the enemy through a gap in his guard. The spirit is to strike him with your body. Turn your face a little aside and strike the enemy's breast with your left shoulder thrust out. Approach with the spirit of bouncing the enemy away, striking as strongly as possible in time with your breathing. If you achieve this method of closing with the enemy, you will be able to knock him ten or twenty feet away. It is possible to strike the enemy until he is dead. Train well.
I’ve never thrown someone ten or twenty feet with it, like Musashi suggests, but I have gotten uke a good 6 feet from me in the air.