To perform a ridgehand block, pull your elbow in, towards your center, to send your hand outward. The motion is similar to a cross-body block, except the impact is made with haitō instead of the meaty part of the forearm. Unlike a cross-body block, it is not necessary to finish with a vertical forearm, and your upper arm should be parallel to the floor, and a vertical forearm. Instead, the blocking hand should be at head or shoulder level, with its elbow a fist-width away from your chest, so the end result resembles a palm-up version of an outside shutō block.
[video or ridgehand blocks, fast and slow, from the front and side]
After performing a ridgehand block, you can easily seize your opponent by either quickly turning your blocking hand over into a grasping block, or hooking the opponent’s hand with a thumbknuckle block.
When performed correctly, ridgehand blocks will cut through the air with a gratifying “woosh” noise, as though you were swinging a large stick.