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Pep, vim or vigor (4 letter answer)
The answer ELAN is very common and appears about once every 31 puzzles.
Joie de vivre
ELAN as a noun:
1. (ardor, ardour, elan, zeal) = a feeling of strong eagerness (usually in favor of a person or cause); "they were imbued with a revolutionary ardor"; "he felt a kind of religious zeal"
2. (dash, elan, flair, panache, style) = distinctive and stylish elegance; "he wooed her with the confident dash of a cavalry officer"
3. enthusiastic and assured vigor and liveliness; "a performance of great elan and sophistication"