Why did that boy show me his muscles?

I'm more curious. What if you're a man? There are two situations, one is to show off, and the other is to drag you to the gym. If you are a woman, there are two situations. One is to see your reaction and wait for you to make a shy expression. The other is very interested in you. You just need to reply: my boyfriend's chest muscles are bigger than yours. He ran away like a lost dog at once!