How many people work in an industry where lifting and moving heavy articles is part of the job? Thousand's. And yet how many would consider a regular massage or how many employers would include a massage as part of their health & safety regime? Very few.
A massage isn't just for a spa day treat. A regular massage can not only help with muscle injury but is a proven preventative to further injury. You wouldn't go weight lifting without preparing your body and lifting at work or home requires the same muscles. Do yourself and your employees a favour.