A Vigor

1. Active strength or force of body or mind; capacity for exertion, physically, intellectually, or morally; energy.
2. (biology) Strength or force in animal or vegetable nature or action.
3. Strength; efficacy; potency.

Usage notes

Vigour and its derivatives commonly imply active strength, or the power of action and exertion, in distinction from passive strength, or strength to endure.