Vitality

As such, people seek to maximize their vitality or their experience of vitality—that which corresponds to an enhanced physiological capacity and mental state.

The latter point of view is characteristic of vitalism, the doctrine that the phenomena of life cannot be explained by purely chemical and physical mechanisms.

[5] Prior to the 19th century, theoreticians often held that human lifespan had been less limited in the past, and that aging was due to a loss of, and failure to maintain, vitality.

[6] A commonly held view was that people are born with finite vitality, which diminishes over time until illness and debility set in, and finally death.

[8] This can be found in the Hindu concept prana, where vitality in the body derives from a subtle principle in the air and in food,[9] as well as in Hebrew and ancient Greek texts.