When you say thin, you mean thin around, right? That is to say, people who look thin visually but don't feel thin technically, right?

This is because the density of fat is less than that of muscle. Just as a mass of cotton is not as heavy as a piece of iron, it is determined by different densities.

You lose fat through physical exercise, so you look thinner. But your muscles have increased, so when you weigh yourself, you feel that your weight has not changed. That's why.

This is a good phenomenon. Physical exercise can not only make you look thin, but also increase your metabolism and improve your immunity.

Come on ~