A couple of sandbags weighing 5 kg each, and the participants had the task of balancing a bag on the head and experiencing what that did to their necks and backs. Of course, no one who was at all apprehensive about this did it.
Why is the sandbag balanced off centre? Because we often do funny things with our heads, (to the extent possible) and create problems for ourselves, only we're so entrenched in our habits that we don't notice it until the problems become acute!
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