be in (one's) element

To be doing something that one is very comfortable with or proficient in. My mother is in her element in the kitchen and can make just about any dish.

Common Names:

Name	Pronounced	Usage
Jarrett	['dʒærit]
Hyder	-	Arabic
Borghildr	-	Ancient Scandinavian, Norse Mythology
Simisola	-	Western African, Yoruba
Stanislas	-	History
Hayden	['heidən]