Age uke, the rising block, takes blows directed to your solar plexus level or higher, and diverts them upward. It can also be used to defend against blows raining down from overhead. To begin a rising block, cross the arms in front of the body, just like a cross-body block.
Using only the shoulder, raise the blocking arm in an arc overhead, with your hand clenched in a fist, and your palm facing downward. Pull the other hand to the hip, to chamber a counterattack.
[video of age uke, from the front and from the side, fast and slow]
The rising blocks found in many martial arts end with the palm facing outward, but In Goshin-Jutsu, our rising blocks end with the palm facing downward. This trivial detail has a profound effect. The forearm is comprised of two bones; the radius, and the ulna. Executing a palm-out rising block causes the ulna to absorb the entire blow. As the wrists turns, these bones shift inside on the forearm. In a palm-down position, the power of an incoming blow will be evenly dissipated over both bones. A palm-down rising block can stop an otherwise bone-crushing strike.
The rising blocks of many other styles raise the arm straight-up, and allowing force to meet force head-on. The subtle rolling motion of the Goshin-Jutsu rising block dissipates the energy of an incoming attack. By rolling over a broader area, the attack will never contacts any one single point, reducing a direct attack to a glancing blow as it is deflected away.
Also, it’s important to keep your head snugly nestled inside the crook of your elbow, to keep you from hitting yourself with your own fist when the block makes contact. (While this seems silly, it will happen if you let it.)