Table 1.

Descriptions to intervention components and relation with potential mediators

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