Inherently resting that it's pure mechanical and only weighs 10lbs. Would be interested in seeing the load distribution diagrams for the back and hips and various body positions...especially for someone with a bit of overhang.
I kind of agree with Olderdan and Frank about the exercise issues but also think that if these weren't a perfect fit for the person they probably will also have some flexibility/mobility issues and create stressors in other areas. Also both these workers were craning their necks, backs and legs to be able to see the fastener placements. The body always compensates.

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