In some school kitchens, one problem for worker safety is that ovens O are at a low level and require heavy lifting from a position lower than the knees
O do not work
Omay explode
O are too high for workers to reach

The first option should be correct

They might be white heads, basically pimples but you should ask your parents to check them out before it’s something bad.

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.