​Khabib Nurmagomedov had an insane gas tank during his run in the Ultimate Fighting Championship, and a new theory has surfaced as to how.Khabib’s late father, Abdulmanap Nurmagomedov, is a revered pioneer of mixed martial arts in Dagestan, Russia. Abdulmanap’s childhood friend recently weighed in on his elite conditioning.While Abdulmanap was naturally fit growing up, he didn’t start training in combat sports until later in life. When he started training at an academy, he had to travel 13.5 miles every day on a bicycle. Abdulmanap would then run for 5 miles, in addition to two hours of wrestling training. His childhood friend believes this extraordinary level of cardio was inherited by Khabib.“His functional fitness was on a very high level,” Abdulmanap’s friend told UFC Eurasia. “He had amazing stamina. Looking at him now, it’s as if the functional fitness he had was passed down to Khabib. I know because I saw it. I wrestled with him on the mat, working in competitions; I went everywhere with him… [Khabib’s] functional fitness is just as sharp. Manap was no worse, perhaps even better.”Known for his suffocating wrestling pressure, Khabib (29-0) ran through the UFC’s lightweight division, winning the belt before defending it thrice. “The Eagle” then retired undefeated in 2020, shortly after the demise of his father.