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Table 1 Descriptions to intervention components and relation with potential mediators

From: Increasing students’ physical activity during school physical education: rationale and protocol for the SELF-FIT cluster randomized controlled trial

Intervention component Description Potential mediators intervened
Teachers’ need support Teachers will be trained to teach using need supportive approaches during teacher workshops. Specific behaviors we will encourage include:
- Providing informational feedback
- Challenge students within their capabilities
- Providing meaningful choices
- Providing meaningful rationale
- Acknowledging students’ difficulties
- Showing genuine care for students
Perceived need support, competence, autonomy, relatedness, autonomous motivation
  Teaching using the SAAFE principles:
- Supportive
- Active
- Autonomous
- Fair
- Enjoyment
Perceived need support, competence, autonomy, relatedness, autonomous motivation, enjoyment
“Fitness dice”activity Teachers will be recommended to spend 20 min of lessons using the fitness dice.
- Target 4 aspects of fitness highlighted by the Education Bureau (EdB) PE curriculum – flexibility, cardiovascular fitness, muscular strength, & muscular endurance
- Four customizable dice with corresponding activity cards will be provided to each teacher: 1. Flexibility; 2. Cardiovascular endurance; 3. Upper body muscles; 4. Lower body muscles.
- Using either a one-to-many or circuit training format, students will complete exercises based on the toss of a fitness die.
- Students could choose a level of difficulty that is optimally challenging to them.
- Both individual and paired activities are included to allow students to choose from.
- Teachers will invite students to provide input for the fitness activities to be included in each die.
Competence, autonomy, relatedness, autonomous motivation, enjoyment
Other motivational components Playing music during the fitness dice activity
- Students can provide input as to what music to play
PE record form for self-monitoring and goal-setting
- Self-monitoring
- Goal-setting
Competence, autonomy, autonomous motivation, enjoyment