Don't know about Kenpo in Pheonix. I've only been there once and didn't work out with anyone, but as long as they are trying to get better, well..
But back to the conversation...
Definition of TOOL
1a : a handheld device that aids in accomplishing a task b (1) : the cutting or shaping part in a machine or machine tool (2) : a machine for shaping metal : machine tool
2a : something (as an instrument or apparatus) used in performing an operation or necessary in the practice of a vocation or profession b : an element of a computer program (as a graphics application) that activates and controls a particular function c : a means to an end d often vulgar : penis
3: one that is used or manipulated by another
4plural : natural ability
Definition 2C works just fine. Kenpo is a means to an end, just like I stated earlier.
Abstract things are used as tools all the time...hate, revenge, love, language, words.