Supporting Physical Literacy at School and Home

The goal of this clinical trial is to test if a multilevel (school, home) physical activity intervention for school-aged (3rd-5th grade) children can increase physical activity levels. The main question\[s\] it aims to answer are: * The impact of the multilevel program on children's physical literacy and physical activity over one school year. Hypothesis: * Whether the program effects are different by children's gender or weight status * Whether changes in children's ability, confidence and motivation for physical activity are related to changes in physical activity levels. Schools will be randomly assigned to receive the multilevel intervention or a control group. Participants in the intervention group will receive a new school curriculum during regular physical education classes and information for families on what school activities can be done at home. Researchers will compare outcomes according to intervention and control group assignments.

Inclusion Criteria: * Child attends school participating in the intervention * In the 3rd, 4th or 5th grade * Participates in the school's physical education class Exclusion Criteria: * Not in the 3rd, 4th or 5th grade * Does not participate in the school's physical education class