What is the difference between myocardial infarction (mi) and cardiac arrest?

According to Heart, cardiac arrest is when heart suddenly stop beating instantly but a myocardial infarction is when a heart muscle lacking from blood supply such as oxygen and cell this cause a heart attack.

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.

Health maintenance organization