The light basket was an easy load on the body and required little effort to carry. The back was straight and body in a comfortable upright position.
The heavy chair required more effort to lift which resulted in a slightly arched back and the knees bent a bit to support the weight.
The heavy box required two people. They had to synchronize together to balance the weight between them. This resulted in both bending the knees and lifting at the same time and putting it down at the same time. They also had bent knees and straight arms to support the weight.
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