Table 2.

Intervention fidelity plan for SSBDJ

Fidelity focus	Recommendation
Design	SSBDJ intervention development is based on the theory that the content validity of SSBDJ interventions needs to be evaluated by experts in Qigong practice or research. The SSBDJ protocol is created to ensure the intervention and the dose are delivered as specified. Assessors/evaluators will be blinded from the SSBDJ intervention.
Training	SSBDJ educational booklet, SSBDJ movement video, and instructors’ feedback are used to facilitate participants’ comprehension. Instructors take field notes (including any observed problems regarding intervention delivery and adverse events) during sessions, and report to the principal investigator. Direct observation of sessions will be conducted to document participants’ performance of SSBDJ exercise in class and to assess if the active components (body movements, respiratory and mind regulation) are delivered.
Enactment	Participants will be required to complete daily exercise logs to track the frequency of home practice and self-reported feelings after practice. Informal weekly discussions via WeChat or telephone will be performed with participants to understand their home practices, including the ability, challenges, or barriers to practicing breathing exercises, body movements, and meditation. Instructors will have regular monthly meetings with the principle investigator to discuss intervention sessions and any observed problems, to prevent intervention drift.