Physical Activity Dimensions	RPPA Questions	Inclusion rationale for survey questions
Social Growth¹	Q1. How do you feel about taking part in physical activities that provide a chance to meet new people?	This question was part of Schutz et al.’s (1985) CATPA survey and considered social growth as it leads to forming friendships.
Health & Fitness¹	Q2. How do you feel about taking part in physical activities to make you healthier or fitter?	This question aligned with Schutz et al.’s (1981) health and fitness value. We considered this as a generic of all forms of health-related fitness.
Vertigo¹	Q3. How do you feel about taking part in physical activities to move very fast and must change direction quickly?	This question was adapted from Schutz et al. (1985) by excluding risk of danger and targeted at PA that requires the skill-related fitness component of agility.
Ascetic¹	Q4. How do you feel about taking part in physical activities to be strong and fit?	This question was included to cover the ascetic domain of hard training PA, such as weight training, or working out. We considered this involved the health-related fitness component of muscular strength.
Cathartic¹	Q5. How do you feel about taking part in physical activities to move constantly and are very demanding on your body?	This targeted PA of vigorous intensity effort (PA ≥ 6 METS) in the Compendium of Energy Expenditure in Youth (CEEY; Ridley, Ainsworth, & Olds, 2008 ). We considered this involved the health related component of muscular endurance.
Fitness	Q6. How do you feel about taking part in physical activities to get your body in better condition?	This dimension, retained from Schutz et al.’s (1985) CATPA survey, was directed at moderate intensity effort (PA = 3.0 - 5.9 METS). We considered this involved the health-related fitness component cardio-respiratory endurance.
Aesthetic¹	Q7. How do you feel about taking part in physical activities that have beautiful, flexible and graceful movements?	This CATPA question was adapted to include the health-related component of flexibility, and target activities such as yoga, aerobics, and dance activities.
Aerobic	Q8. How do you feel about taking part in slow steady physical activities where you do not get out of breath?	We designated this dimension as aerobic exercise and was added to cover PA of light intensity effort (PA ≤ 3 METS) in CEEY.