noun
Refers to the physical or mental ability to sustain prolonged effort; often used in sports, fitness, and perseverance contexts.
マラソンには持久力が必要だ。
Marathons require stamina.
彼は持久力があるので、長時間の勉強でも集
He has endurance, so he can stay focused even during long study sessions.
忍耐力 is patience or the ability to endure hardship mentally, whereas 持久力 can refer to both physical and mental stamina.
Compound of 持久 (jikyū, 'endurance') + 力 (ryoku, 'power'). The exact historical derivation is uncertain, but the kanji composition transparently conveys the meaning of sustained strength.