First of all, it is not recommended to wear pure cotton underwear, because a lot of sweat can not be distributed in time, which will not only make underwear unable to keep warm, but also make people feel cold, and the friction between skin and clothes will increase.
If you wear tights during exercise, it is best to wear single-layer, close-fitting and light underwear suitable for physical activities, which can reduce the tightness of tights and reduce the friction between clothes and skin during exercise. It is recommended to wear boxers. The marks formed by the edges of briefs on the outer tights will cause indecent impressions in public places such as gyms, and sometimes lead to embarrassing training atmosphere.
Ordinary people don't have to wear tight pants when exercising, and wearing loose sweatpants will also make the training process easier. Friends who like tight pants can wear two-piece sweatpants, with tight pants inside and loose shorts outside.