A backpack ( filled) should weigh 10% to 20% of your weight. Anything more can strain your muscles and cause falls.
- Kids Back to School Health Quiz – Parade Magazine
Joe Kita - Parade August 21, 2011
To be alert and healthy, the ideal sleep time for teens is 8.5 hours to 9.25 hours. Most teenagers get only about 7 hours. Students aged 5 to 12 need 10 to 11 hours of sleep.
Kids Health Quiz – Parade Magazine