Renzoku translates into English as consecutive, continuity, serial. Bunkai is used in the martial arts to describe the application of techniques found within the traditional kata. Renzoku bunkai is therefore simply a series of applied techniques, practiced in a continuous manner. Within the IOGKF, it commonly relates to a specific two person drill in which the kata Gekisai Dai Ichi is performed in a straight line by the ukete (defender) whilst a sequence of corresponding offensive and defensive techniques are executed by the semete (attacker). This drill is also known as Chokusen Gekisai Dai Ichi, literally meaning straight line Gekisai Dai Ichi.
Sensei George Andrews has developed a variation of this drill in which each technique is practiced three times and the roles of attacker and defender are changed at the end of each three step sequence, until the very end, which is reminiscent of the original sequence.
In the video below, Sensei Dave Amber and Sensei Martin Stockley demonstrate the original form of renzoku bunkai and the variation.
Chief Instructor OTGKA