An antiseptic is a substance used to kill germs inside the skin or on the skin ? or kill germs on the surface ?

Antiseptic kill germs. The are used on the skin and surfaces to prevent any germs from growing.  They are generally harmful if ingested, so you you don't want to put them inside the skin because you can also kill good germs.

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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