Table 1.

Details about the ToyBox-intervention materials for the sedentary behaviour module

Material	User	Content	Implementation
Classroom Activities Guide	Teachers	Part 1:
		Environmental changes in the classroom:	Throughout whole school year
		- Standing play stations - Doing activities while standing - Use the hallway
		Part 2:
		Child performing the actual behaviour; i.e. short movement breaks:	Throughout whole school year
		- Spin the wheel - Play statue - Flamingo -Marching - Fireworks - …	During the first focus (weeks 13–16) and repetition period (weeks 23–24)
		Part 3:
		Classroom activities:
		- Kangaroo stories - Longer movement breaks - Movement corners - Television bingo - “No TV”-signs - Weekly calendar - …
Kangaroo hand puppet	Teachers	The kangaroo is used to support the activities that are being carried out. The kangaroo is a mascot of the study.	Throughout whole school year
Newsletters	Parents	Newsletter 1:
		- General information about sedentary behaviour - Guidelines regarding screen time and sedentary behaviour - Tips to limit children’s time spent sedentary - Activities that are being carried out at kindergarten - Tips for movement breaks	During the first focus (weeks 13–16)
		Newsletter 2:
		- Guidelines regarding screen time - Tips to decrease children’s screen time - Activities that are being carried out at kindergarten - Parents are a role model
			During the repetition period (weeks 23–24)
Tip-cards	Parents	Tip-card 1:
		- Tips to replace sedentary behaviour into active behaviour - Tips on how to motivate the child	During the first focus (weeks 13–16)
		Tip-card 2:
		- Tips on how to decrease screen-related activities - Tips for parent-child activities	During the repetition period (weeks 23–24)
Poster	Parents	Key messages:
		- Don’t sit down for a long time – get up and be active! - Do not eat in front of screens! - Limit screen viewing activities – make your own experiences! - Include active movement breaks in the children’s daily lives!	During the first focus (weeks 13–16)