Table 2.

Theory-based mediators and corresponding behaviour change techniques

YPAPM	Theory	Mediator	Behaviour change techniques (13)
Predisposing Individual level	Self-determination theory	Competence	(2.2) Feedback on behaviour: The teacher provides feedback on performance of the physical activity behaviour during PE and informs the students whether they were active during the lesson and how they can improve their activity levels. (8.7) Graded tasks: The teacher sets easy-to-perform tasks in and after PE, making them increasingly difficult, but achievable, until behaviour is performed. (8.1) Behavioural practice/rehearsal: Sufficient practice time should be included in each PE lesson. Moreover, practice or rehearsal of the performance of the behaviour should be prompted once or more times in a context or at a time when the performance may not be necessary, in order to increase habit and skill without any social pressure.
	Self-determination theory	Autonomy	Providing choice [38]: The teacher supports students’ autonomy during PE by providing them a choice between different contents during the PE lesson and for different activities during the afternoon.
Reinforcing Interpersonal	Self-determination theory	Relatedness	(3.1) Social support: Teachers advise on, arrange or provide social support (e.g. from friends and parents) or non-contingent praise or reward for performance of the behaviour.