Force multipliers in effect.
A force multiplier is something that increases effectiveness. The term has military origins — factors like high morale, advanced technology, or brilliant tactics could all be considered force multipliers. The Mongols used horse archery, silk underclothes (to prevent infection from piercing wounds), and a fearsome reputation as force multipliers.
Applied to life in general, what kind of factors function as force multipliers? What areas of life, if improved or optimized, make us more effective in every other life area?