1. The material of swimming trunks is very elastic and the fit is relatively tight.

2. There is a tightening belt at the top of the swimming trunks to tighten the pants.

3. When athletes choose swimming trunks, they should choose the appropriate size and not loose ones.

Fourth, the movements should be standardized to ensure that the swimming trunks do not fall off.

If the swimming trunks come off, just pull them up and put them on again.