Are you full of life? Vigorous and energetic? Lucky you. You have vitality, the state of being strong and in great health.
Vitality also has the general meaning of "life force," as in the mysterious power that separates the living from the dead. The phrase "vital organs" comes from vitality, meaning a person's inner organs most essential to life. Abstract things can also have vitality, as in "the vitality of the state" or the vitality of Broadway Theater."