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
Janetta	jə-NET-ə	English (Rare)
Tzipporah	-	Hebrew, Biblical Hebrew
Prateek	-	Indian, Hindi, Marathi, Gujarati, Bengali
Sigiheri	-	Ancient Germanic
Cenhelm	-	Anglo-Saxon
Yama	-	Hinduism