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
Predrag	-	Serbian, Croatian
Bricius	-	Ancient Celtic (Latinized)
Kyllikki	KUYL-leek-kee (Finnish)	Finnish, Finnish Mythology
Anneli	AHN-ne-lee	Finnish
Maas	MAH:S	Dutch
SÉGolÈNe	-	French