May 10, 2011: Joe Korziuk has spent 23 years working for U.P.S. washing trucks, delivering packages and driving tractor trailers. Though he loves the job, it has a downside: At 45, he has had surgery on both knees and a shoulder, developed bulging disks in his back and sustained a concussion when boxes fell on him.

“It’s a direct result of the job,” Mr. Korziuk said. “They’re always harping on you and pushing you to go faster and faster.”

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