What does Boxing Day have to do with boxing?
1590s, "action of imparting life," from Latin animationem (nominative animatio) "an animating," noun of action from past participle stem of animare (see animate (v.)). Meaning "vitality" is from 1610s. Cinematographic sense is from 1912.
animation an·i·ma·tion (ān'ə-mā'shən)
The state of being alive.
Liveliness; high spirits.