Many people will be spending a large part of their waking life on chairs, whether driving, working or at leisure — and lying on a
soft sprung mattress to sleep will also leave the skeleton disengaged, as the skeleton needs to rest completely firmly,
otherwise the various parts of the system will constantly be trying to readjust, and so can not rest completely — all leading to a premature ageing which we in the West accept as «normal» — like sitting in chairs, sitting on toilets, and sleeping on
soft beds.