This site's own benefits section lists this specific third point: overall vitality.
This site describes it directly: a daily routine built to support how you feel, day to day — worth reading this as the broadest of the five benefits, encompassing the more specific energy and stamina points listed separately.
Worth reading "overall vitality" as this site's summary framing rather than a distinct, separately measurable outcome from steady energy and stamina support — the three benefits overlap by design.