What health topic would you choose and what medium would you use to convey your message?

I would Choose how to prevent people from eating and drinking unhealthy foods and convey the reader by mentioning what the affects are from eating the foods and how to prevent public places to stop selling unhealthy foods/drinks

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.