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Use double quotes to find documents that include the exact phrase: "aerodynamic AND testing"
The Sport Information Resource Centre

Unstructured play contributes to the mental health of children and youth by promoting positive feelings through experiences of joy, thrill and competence; building children’s resilience through challenging or risky play; and improving healthy relationship by building problem-solving and emotional intelligence. Download an infographic summarizing five key findings relating to unstructured play and mental health.