Proportion is
a.
the all-encompassing reproduction of a person or thing.
b.
the relative size of an object as compared to another, or as compared to the other elements in the piece.
c.
the arrangement of visual elements in a piece, which to create understanding and convey the artist's message.
d.
the arrangement of elements in order to create equilibrium and a piece that is aesthetically pleasing.

B. the relative size of an object as compared to another, or as compared to the other elements in the piece.

b.
the relative size of an object as compared to another, or as compared to the other elements in the piece.

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.