If you wanted to increase your muscular endurance, it would be important to participate in activities that

If you wanted to increase your muscular endurance, it would be important to participate in activities that increase the size of the muscle cells and the amount of blood that is delivered to the muscle. 

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.