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Challenges primarily related to the hiring of yoga instructors who were not trained in research methods. We found issues with (1) logistics of hiring, training, and retaining instructors; (2) communication between teams; (3) fidelity to the protocol and outcome assessments; and (4) ensuring safety. We found that a randomized trial of individualized yoga presented new challenges when relying on externally contracted yoga instructors. Future multicenter studies of yoga should seek to better integrate practitioners within the research team