выносливость bedeutet auf Englisch

endurance▼(the measure of a person's stamina or persistence)
noun
[UK: ɪn.ˈdjʊə.rəns] [US: ˈen.də.rəns]

mettle▼(a quality of endurance and courage)
noun
[UK: ˈmet.l̩] [US: ˈmet.l̩]

stamina▼(power of sustained exertion)
noun
[UK: ˈstæ.mɪ.nə] [US: ˈstæ.mə.nə]