Power Breaking refers to tameshiwari focusing on maximum power. This differs from other applications which may test accuracy, speed, or other specialized techniques.
The term power breaking most often refers to breaking blocks or boards separated by spacers. This allows the practitioner to exert absolute full force with minimal risk of injury. This type of breaking is largely a test of momentum. The ability to get through numerous boards or blocks in a stack depends on how long the practitioner can preserve the force of the initial impact. Because of this, the practitioners body weight becomes and asset and the most successful power breakers are often physically large. As discussed in the article on the use of spacers, this type of breaking does not require an especially high level of conditioning, but it does require a lot of force.
Though less commonly the case, power breaking can also refer to the breaking of especially sturdy materials. This is done without the use of spacers and is a test of initial impact. This is arguably the most difficult test of tameshiwari. Likened to weightlifting, this would be equivalent to a single, maximum bench press or dead lift. This practice requires the highest level of conditioning in order to absorb the force of the single, initial impact since spacers are not there to provide gradual resistance. This may also be considered the worthiest variation of tameshiwari since the ability to break the strongest objects translates directly to the type of damaging force required for combat application.