Boys can't be too fat or too thin. You can measure the health index of that height and weight, it can measure

Is your current weight suitable for your height?

Actually, I think it doesn't matter if boys are fat. Although little girls nowadays like thinner boys, your health is the most important thing.

Don't overload yourself with something to cater to the public's aesthetics, just do some exercise properly.

If boys are thin, they should take more exercise to keep healthy. How else can they protect their families and girlfriends in the future?