How do we know rainsford is an exceptionally fit man?

Rainsford is portrayed as exceptionally fit in “The Most Dangerous Game” through his abilities as an accomplished big-game hunter, his physical agility and endurance during the hunt with General Zaroff, and his survival skills in overcoming the challenges set by Zaroff. Additionally, Rainsford's resourcefulness and quick thinking in adapting to his environment further emphasize his exceptional fitness level.