Would you have to exchange your money if you live in france, but go on vacation in germany?

Yes because you have to use their currency because it’s their country

No, you wouldn't have to change money, because both France and Germany are country members of the european union and they have the same currency (euros €). 

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.

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