Postures are unsupported positions that can stretch your physical limitations. these postures can compress your nerves and irritate tendons. they may include bending, twisting, or working with your hands above your head or elbows above your shoulders

Explanation:

We can define awkward postures as those body positions that deviate significantly from the neutral axis position or they are maintained for a long period of time. For example, the neck have a neutral posture is you don't move it, because you are in the neutral axis, if you move a 15 to 30% more often, you will be able to do it, but if you move more than 50% of the time, you will be in a awkward posture.

Same thing with back postures, you can bend a couple of times, but if you do it all the time, soon you will be having pain, because you are often putting your back in a awkward position. Another case is when you bend a few times, but you do it extremely, in such flexible ranges, soon or later you will be having pain.

need more in formation

when you rub, you also apply pressure, that pressure can urge the poop to come out. i think that when your rubbing, you also might be slightly breaking it up and that can further fill the stomach.