Susan, a woman of relatively normal weight, sometimes eats huge quantities of junk food with no ability to stop herself. She follows this with long periods of complete fasting. Based on this information, Susan would
be diagnosed with bulimia nervosa.

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.