In my karate school, we tend to work at several levels of resistance, though there are no terms for these levels, and no real distinction drawn between them. However, I feel it prudent to set up a skeletal framework for the introduction of resistance in learning the so-called "classical" or "traditional" arts - the arts which tend to place emphasis on forms/kata training.
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Level 0:
0 Resistance - Forms/Kata practice. Includes initial introduction to techniques, as well as all manner of one-person formwork, shadowboxing, and the like. At this level, focus for the beginning and intermediate student is on developing a general understanding of the intended motion. For the more advanced practioners, a basic study of strategy is available, as is the free study of intended physical structure within certain techniques or ideas.
Level 1:
Two-Man Drills. Training at this intensity level tends to focus on translating the concepts garnered at Level 0 into executable techniques recognizable as the "style" or "method" of the practitioner. (also includes bagwork, padwork, et al)
Level 2:
Low-Intensity free-sparring. Focus at this intensity level is on allowing the student to actively test the techniques/concepts introduced at the previous levels against a completely non-cooperative opponent.
Level 3:
High-Intensity free-sparring. Focus herein is the same as Level 2, only the pressure is raised a few notches - not, however, at the cost of safety or lack of control of trainees.
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It is my opinion that training with this type of sliding scale of resistance will allow a student of a "classical" or "traditional" art to apply their style's techniques and strategies under stress.
Any thoughts?