Why do we other lean posterior on our chairs?

i'm just wondering... why do we other (not everyone) but why do people lean stern on their chairs?
It really bugs me even though i do it myself.


Answers:    Scoobs is right....laziness I presume. Sometimes also our bodies get so tired and sore of sitting contained by the same position we resembling to move around, for a few seconds it make us feel better. Maybe we should get hold of some better, more comfortable chairs.
laziness, comfort, boredom, lots of reason.
Because they don't have wheel.
In my opinion it's not annoying if you're at home, within your garden or with friends; but I'm curious around this when people loll subsidise in their chairs at church when the priest is giving his sermon.

One time, the childish priest asked the congregation: "Are we all sitting comfortably?" Some agreed that they be, but I'm sure I must have started shifting around contained by my seat uncomfortably when he started to speak around a tricky topic! I think the priest found it amusing - the thought of some empire skirming in their form, after they agreed they were 'sitting comfortably'. Cheeky!
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