vigour

(noun) forceful exertion. Synonyms: energy, vigor, zip. Examples: "He plays tennis with great energy." "He's full of zip."

(noun) active strength of body or mind. Synonyms: vigor, dynamism, heartiness.

(noun) an imaginative lively style (especially style of writing). Synonyms: energy, muscularity, vigor, vim. Examples: "His writing conveys great energy." "A remarkable muscularity of style."