Swimming is a skill that characters use to physically move about in water without drowning.

Shoresh: שחי
Alternative shorashim:
At least one round
Stats used:
Usually LIF if it involves athleticism, endurance swimming and holding one’s breath. GRA may be relevant when it involves agility in the water.
The strength of underwater currents, the depth of currents, wave height, the length of time underwater, and obstacles can make swimming rules more difficult.
Resist: This usually doesn’t have a resist skill.
Success: This is a broad skill, but it often means getting from Point A to Point B, or swimming to safety without drowning.  
The user fails to arrive to the target destination. A botch could mean drowning.