More than 50 per cent of young people experience at least one episode of lower back pain by their teenage years: Research indicates that this could be caused, to a great extent, by improper use of backpacks. If your child does complain of back pain, numbness or weakness in his or her arms and legs, get help to prevent future problems. PACK IT LIGHT. WEAR IT RIGHT Kids think it’s “cool” to strap on their backpacks and head out to school. But if they don’t know exactly how to c