stayer
US /ˈsteɪ.ɚ/
UK /ˈsteɪ.ɚ/
1.
a person or animal that continues to do something or to be active for a long time, especially in a race or competition
:
•
She's a real stayer, always the last one on the dance floor.
•
The horse proved to be a good stayer in the long-distance race.