stamina
noun
[ ˈstamɪnə ]
• the ability to sustain prolonged physical or mental effort.
• "their secret is stamina rather than speed"
Similar:
endurance,
staying power,
indefatigability,
tirelessness,
resistance,
resilience,
fortitude,
strength,
vigour,
energy,
staunchness,
steadfastness,
robustness,
toughness,
determination,
tenacity,
perseverance,
grit,
Origin:
late 17th century (in the sense ‘rudiments, essential elements of something’): from Latin, plural of stamen in the sense ‘threads spun by the Fates’.