How can to transform a Part into a swimmable Part?

Hi! I need to know what's the script for peoples can swim in an part outside from a Water Terrain? I have a Part that have a texture but i need to get the script for make it swimmanle, Can you guys help me?

you mean this?

https://www.youtube.com/watch?v=-XT01xehzQY&t=1s&ab_channel=ImaSeraph

just change the fall animation.

or instead, try this: https://www.youtube.com/watch?v=DMdEPvK40PU&ab_channel=ImaSeraph