Physical condition is important.
I don't have it and never have. Been overweight all my life.
However, from being on this board from day one, I've also been in more fights and confrontations than most of the people on this board who are not combat veterans. (Fifteen years of repossessing and collecting bad debt face to face...most in areas where the police rode in pairs.)
I've got a pretty good record. I can't remember exactly how many fights I've been in but probably somewhere in the neighborhood of thirty more or less. I can remember how many losses I've had...three. In all three, I was hit in the head from behind before I knew a fight was in progress. Out of the ones I won, one was 2 on me, one was four on me, and one was eight(special circumstance, they were coming to my campsite at night to beat me, I had prior warning...and a three foot sawn off shovel handle and it was nighttime-I ambushed the lot) I'd put situational awareness and superior intelligence gathering capability ahead of physical condition based on my experiences.
Another thing I'd rank higher is retaining the initiative. Fellow students in my high school learned not to give me advance warning. Some guy would come up to me in the hallway or classroom and say,"Wait until after school, punk." And BOOM! I'd go upside his head, get him in a headlock, trip him, use my overweight butt to pin him to the floor and just do my darndest to ruin his face before I got pulled off of him. Never had but one of those guys come back for seconds and he was with a friend...didn't help as I kicked his help in the balls and proceeded to choke him into unconsciousness to the point that when I was finally peeled off of him he required rescue breathing.
Don't get me wrong, I am in total agreement that physical conditioning is good and that it is an advantage that is good to have. But, people, no matter how good a shape you're in, you are not going to have it always. What are you going to do when you're 85 and have fragile bones? Give up and let the bad guys win?
Tell you what, you can take any UFC fighter you want and on my side give me an arthritic, diabetic, fat, ninety year old woman. Let me pick the terrain for our combat. You and the UFC champion are going to find that you have to climb a tall ladder to get to us. We're waiting for you to try at the top of the wall. I'm in good enough shape that even at 53, overweight, post-stroke, two spinal cord surgeries...I can carry two concrete blocks up to the top of that wall. I don't think you're going to like your day. Tactical advantage. Biggest worry I'd have would be getting her on top of the wall and might just tell her to hide behind as I have all the help I need with gravity. Use of strategic concepts such as shielding my weaknesses, avoiding your strengths while attacking your weaknesses.