Pushing the body harder than it's ready to be pushed during exercise
a. can result in damage to the body.
b. makes a person mentally and physically stronger.
c. is the best way to train for competition.
d. ensures quicker fitness results.

The correct answer is A.

Pushing the body harder than it's ready to be pushed during exercise can result in damage to the body. You should never overexert yourself during exercising, if you do you are putting extra pressure on your organs, on your muscles, on your tendons and ligaments and your bones. You should always exercise at the right level for your body and if you feel pain or dizziness then you either stop, slow down or change the exercise.

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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.