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
Gill	[gil]
Rouben	-	Biblical Greek, Armenian
Katriona	kə-TREE-nə, kat-ree-O-nə	English (Rare)
Sancho	SAHN-cho	Spanish
Peredur	pe-RE-deer (Welsh Mythology)	Welsh Mythology, Arthurian Romance
Jamshid	-	Persian, Persian Mythology