Answer: stamina

AnswerCrossword Clue
STAMINAMarathon runner's need
STAMINAFlower parts
STAMINAMiler's need
STAMINADurability
STAMINAMarathon-runner's forte
STAMINAPower to endure
STAMINAWhat rash dieters lose
STAMINAMiler's sine qua non
STAMINAMarathoner's requirement
STAMINAStrength
STAMINAWorkhorse's quality
STAMINAIntestinal fortitude
STAMINAMiler's asset.
STAMINAIt helps you go the extra mile
STAMINALasting ability
STAMINAThe stuff that marathoners are made of
STAMINATriathlete's quality
STAMINATriathloner's quality
STAMINATriathloner's need
STAMINASomething a long-distance runner needs
staminathe pollen-bearing organ of a flower
staminaendurance
staminaendurance
STAMINA10K need
STAMINAEndurance
STAMINASpine
STAMINALasting quality
STAMINAMarathoner's need
STAMINATriathlete's need
STAMINAStaying power
STAMINAIt's needed to finish a marathon
STAMINAFortitude
STAMINALasting power
STAMINALegs
STAMINATriathlete's asset
STAMINAMarathoner's quality
STAMINAInner strength
STAMINAAsset for the long haul
STAMINAMarathoner's asset
STAMINAPower of resistance.