Kraven possesses superhuman abilities conferred upon him via special herbal potions he periodically ingests. These abilities include enhanced strength (optimally lifting 2 tons), speed (able to sprint short distances at 60 mph), agility, stamina, and longevity. He can perform a standing broad jump of 20 feet. He can exert at peak levels for a half-hour before fatigue impaired performance. Despite his advanced years, Kraven maintains the physical age of a 30-year-old.
They gave him the things he had in the comics.
https://www.marvel.com/characters/kraven-the-hunter-sergei-kravinoff/in-comics
I stand corrected. It’s been awhile since I read Last Hunt.