The makiwara is used by karate practitioners to practice strikes in much the same way as a boxer uses a heavy bag. The makiwara develops one’s striking ability by letting them experience resistance to punches, kicks and other strikes. A poor punch will bounce off the makiwara if the body is not in a position to support the energy generated by the strike. It also develops targeting, and focus, which is the ability to penetrate the target (i.e., opponent) to varying degrees of force.
Assorted kata bunkai (interpretation) demonstrated by David Walker Sensei, 6th Dan, Shintokukai out of the Pinan (Heian), clip 1 and 2.
Soke Yoshimi Inoue explains bunkai and oyo bunkai of the opening sequence of the kata pinan shodan/heian nidan. In the manner of “sen no sen” the sequence appears in new light.