Genki (元気).

Genki (元気), the word/phrase, pleases me for its optimism: gen (元), the original, the root, and ki (気), the spirit/energy. お元気ですか？o-genki desu ka? Is your energy where it's supposed to be? Probably the understanding of it is no longer so literal, and possibly the kanji were retro-fitted to the spoken language, but for me it works.