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
Ajla	-	Bosnian
Enok	E-nok (Swedish)	Swedish, Norwegian, Danish
Eardwulf	-	Anglo-Saxon
Sunngifu	-	Anglo-Saxon
Flo	[fləu]
Siegbert	ZEEK-bert	German