I’m going to introduce an exercise that improves my metabolism.
Your body thinks you want to substitute new exhibits inside yourself but it apologizes and replaces them more than you'd like. What it's actually doing is controlling your metabolism. Picture your body using food you eat by setting it up in an exhibit in your stomach. But it gets bored of it and wants to substitute it with a newer one, so it makes you hungry again, digesting the food fast.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.