Why should fitness equipment be purchased new?

It is important to purchased new fitness equipment for second-hand item may results in a lower quality that is poorly made and has the tendency to break quickly than the new ones. New fitness equipment has warranty from any kind of damage, excessive wear, cracks, rust or other defects. 

Moreover, an important aspect of buying used fitness equipment is that you cannot ensure that the equipment is still safe to use like making sure the emergency shut-off switches works properly, checking the electronics and wires for fraying or other signs of damage making them less effective and putting you at a higher risk injury.

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.  

c would be the answer