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Carrying heavy backpacks are common among school age children and that’s a problem. According to a study conducted by the Simmons College Graduate Program in Physical Therapy, over 55 percent of teenagers carry backpacks that are over 15% of their body weight, a limit that is recommended by American Chiropractic Association as well as American Academy of Orthopedic Surgeons. By the end of their teen years, for example, more than [...]