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APB I covers the first three tiers of the Arc Barrel, Spine Corrector, and Ladder Barrel — and the logic behind when to choose each one for each client and session. Barrels can make a mat class more inclusive or add a core-strengthening challenge to a private lesson. APB I completes the All Populations I Comprehensive Curriculum.

Once you’ve completed your All Populations I Barrels coursework, APB II opens the door to the final two tiers of the Barrels repertoire — the Advanced Intermediate and Advanced work designed for clients who have grown past Intermediate and the instructors ready to take them there.

All Populations II courses are required to achieve Comprehensive Certification, to sit for the NPCP exams (Mat, Reformer, or Comprehensive), and are a mandatory prerequisite for PAI Master Trainer pathway consideration.

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