Vigor (noun)

1. Active strength and good health.
2. Energy and enthusiasm in the pursuit of a goal or task.

Origin:

From latin vigor "activity, energy, strength".

Examples:

1. The athletes were full of vigor after a good night's sleep.
2. The company's new CEO brought a renewed vigor to the business.
3. The dancers were performing with great vigor and energy.
4. The team's performance was lacking in vigor and they lost the game.
5. He approached the task with a great deal of vigor and determination.