Very good point.
I had a friend in college who had been a lifelong wrestler and had done boxing, Muay Thai and BJJ for years. He was working towards becoming a professional fighter. Think he was a middle weight. I asked him what his priorities were and he told me his coach told him it was all about “legs, lungs and heart”. Kind of stayed with me over the years. I interpreted “legs” as muscular endurance or the ability to pop back up/conduct explosive movements. Lungs is obvious.
As a former big time fatty I remember putting up decent numbers with my lifts, which would be contrasted by being out of breath going up a flight of stairs. I realized someone could probably kill me without much difficulty because I could hardly move. Throw me to the ground and I wasn’t getting up anytime quick.