Children and adolescents should get one hour or more of physical activity daily.Aerobic: Most of the 60 minutes a day should be aerobic activity of at least a moderate intensity, at which a person will sweat and the heart will beat faster. The intensity should reach a vigorous level at least three days a week.Muscle-strengthening: At least three days a week, the activity should include something to strengthen muscles — lifting, pushing or pulling weight, including the body.Bone-strengthening: At least three days a week, the activity should include something to strengthen bones — skipping, hopping, jumping or running, for instance.Source: U.S. Department of Health and Human ServicesSchool is out. The sun is shining. But more and more, kids aren’t leaving the couch.The structured physical activities offered in schools — through physical education classes and, for younger kids, recess — keep kids active during the school year, said Tricia Mortell, program manager at Clark County Public Health.But when the bell rings for the final time in June, some kids are left to their own devices. And that can mean more time in front of the TV or computer, she said. Gabrielle Briggs, 7, beats Ian York, 9, to the ball during soccer drills at a mini sports camp Thursday at Marshall Park in Vancouver. National physical activity guidelines recommend children and adolescents get at least 60 minutes of exercise every day.