natural shoulder strength; innate throwing power
Refers to one's inherent or untrained shoulder strength, especially in contexts like baseball pitching or throwing. Often used when discussing natural talent versus trained ability.
He has strong natural shoulder strength, so he can throw a ball far.
地肩だけで投げていると、すぐに肩を痛めるよ。
If you throw using only your natural shoulder strength, you'll hurt your shoulder quickly.
Compound of 地 (じ, 'base, natural') and 肩 (かた, 'shoulder'). The exact historical derivation is uncertain, but the word transparently refers to one's fundamental shoulder capacity.