energy, vim, vitality -- (a healthy capacity for vigorous activity; "jogging works off my excess energy"; "he seemed full of vim and vigor")
life force, vital force, vitality, elan vital -- ((biology) a hypothetical force (not physical or chemical) once thought by Henri Bergson to cause the evolution and development of organisms)
animation, vitality -- (the property of being able to survive and grow; "the vitality of a seed")