What is the role of the rectum?

The key role of the rectal ampulla is to act as a temporary storehouse for feces

The rectum is the concluding part of the large intestine that terminates in the anus. ... However, it becomes larger near the anus, where it forms the rectal ampulla. The key role of the rectal ampulla is to act as a temporary storehouse for feces

Well if you pick a machine to work on and that's gonna be your exercise if you don't stick to that machine your muscle strength your muscle mass rather will change because you haven't been doing it you change something in your exercise routine which changes your body's form of dealing with things for example you might become weaker or stronger depending on what kind of exercises you do in whether or not the machine you picked actually your muscles grow.