Tight shorts in sports

Question

Hello,

*Why male athletics especially runner (as I mention) use stretchy

Shorts (tight underwears)? Is it nessesary, or not? What is your

recommendation?

*How should it be in general for men?

Thank you very much for your cooperation
Good bye

Answer
Well, i guess for runners, its so they can run fast and not have something dragging behind them. Also, they say that its more aerodinamic. Some people wear them because its in style or because their legs are cold. These reasons vary from person to person. I dont know what you mean by how it should be in general for men. Can you further explain that?