A study published in The Lancet Child & Adolescent Health finds that when kids spend more than two hours on screens every day they tend to perform more poorly on tests of cognition. According to The Canadian 24-Hour Movement Guidelines for Children and Youth at least 60 minutes of physical activity per day 2 hours or less recreational screen time per day and 9 11 h sleep per night in children aged 8 11 years is recommended. For the study the researchers observed that not many kids stuck to these guidelines. They further observed that kids who were spending more