Very comprehensive article about back injuries, prevention and treatment by Josh Cable
"Of the 1.3 million reported lost-time injuries and illnesses in private industry in 2003, sprains and strains – most often involving the back – were far and away the leading type of injury in every major industry sector, accounting for 43 percent of the total lost-time cases, according to the Bureau of Labor Statistics (BLS)"
"While it's not easy to put a nationwide price tag on back injuries, the 2005 Liberty Mutual Workplace Safety Index found injuries caused by overexertion – defined as excessive lifting, pushing, pulling, holding, carrying or throwing an object, all of which are key ingredients of back injuries – cost employers $13.4 billion."
Maintaining the curve is key. It is suggested we unlearn proper use of a out bodies at a young age, around 4 or 5.