Doing something for 8 hours a day is different from doing something for 2 hours.
Doing something in countless repeats is different from having a set of 20 on this machine,break, having a set of 20 on that machine.
Doing something on an ergonomically designed equipment and personally chosen weights is different from doing something in forced postures and/or moving given weights that are too heavy for you because that’s the package size of concrete.
Being able to take a rest of a few days if you are injured is different from not having a sick leave.
Gym machines usually don’t produce noise, dust, chemical fumes etc that often cause the actual damage in physical labor.
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