Table A1.

Metabolic equivalent (MET) scores of the activities and categorization in muscle and/or bone strengthening activities [10,11,37].

Domain	Activity	MET-Score	Muscle Strengthening *	Bone Strengthening *
Transport to work or school	Walking to work or school	3.3	YES	YES
	Cycling to work or school	5.8	YES	NO
Leisure time	Walking during leisure time	2.7	YES	YES
	Cycling during leisure time	5.8	YES	NO
	Gardening	3.8	NO	NO
	Odd jobs	3.0	NO	NO
At work	Working activities, light/moderate	1.5	NO	NO
	Working activities, vigorous	4.5	NO	NO
Household	Household activities, light	2.5	NO	NO
	Household activities, vigorous	4.3	NO	NO
Sports	Sports	Depends on kind of sport	Depends on kind of sport	Depends on kind of sport

* Based on the available data and the definition of the physical activity guidelines by the Dutch Health Council activities and sports were categorized as either muscle and/or bone strengthening. Bone strengthening activities were defined as activities involving strength training and bearing body weight, for example jumping, walking stairs, walking, running, and dancing. Muscle strengthening activities included activities to increase strength, capacity, endurance, and muscle size, for example, exercise with the use of bodyweight and aerobic activities. Aerobic activities should involve large muscle groups, for example, walking, swimming, cycling, and dancing.