A state of lost physical fitness, which may include muscle imbalances, decreased flexibility, compromised or maladaptive movement patterns, and a lack of core and joint stability.

Energy is the fundamental constituent of reality. Even what we call "physical matter" is a form of energy. This means that our bodies are a form of energy. Light, sound, movement, resistance, respiration and vocalization are forms of energy. This is not woo-woo, this is our best and latest science. Consider this statement by Martin Picard, PhD, a mitochondrial psychobiologist at Columbia University: "So, what are you? Are you a molecular machine? Or are you an energetic process? And I think the truest answer...the answer is that you're both. But if you ask, 'what is most fundamental?' What is most fundamental is not your physical existence, it is actually you as an energetic process, as a flow of energy."

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"Healthspan" is a term used to refer to the time span in which a person lives with a robust level of health and well-being, rather than the mere length of time someone remains alive. Sadly, hundreds of millions of people today experience compromised health as they age - their lifespan doesn't match their healthspan. One's healthspan is the duration of life in which someone sustains adaptive function, physical and mental capacity, and is free from chronic disease or illness. The term is meant to reflect the value of quality of life in addition to mere quantity (length) of life.

To learn more, check out this article from Harvard Medical School.