Describe what a vaccination is made of and how it prevent infection

A vaccination is made of dead or weak cells from the disease it is suppose to protect against. When it is injected, the immune system reacts by destroying it, so if you get the actual sickness your body knows how to fight it.

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.