Obviously, the fat guys too lazy to work out think that the number 1 tactic of "pull my gun and shoot them", is the end all of self defence. They don't even begin to think of the fact that the bad guy may well be right on top of them, and they may have to fight to 'clear a space' for them to pull thier gun and shoot them.
Unfortunatly, living in the peoples republik of Maryland, CCW is not in the cards in my lifetiime. So I don't have a choice, I have to remaian fit enough to use that blackthorn stick I carry, as well as the knife or screwdriver. I have to work out with others of my ilk to keep up on practice of some basic MA and my old army combatives. I have to remain as fit as possable given that at my and my better halfs age, in the 60's, we're getting into the older citizen range that criminals like to target. That means keeping the weight down, using the eliptical and rowing machines down in the family room in the basement, walking everyday an hour walk in a local regonal park with very hilly trails.
It means keeping very fit as statigies and tactics. Being social security retiries, we tend to travel in numbers, and all male members carry a stout stick of some sort. All the women carry regular police size canisters of pepper for range. In addition to our own personal work outs at home, we have get togethers where we hang up an old duffle bag stuffed with rags, and the men, mostly old vets like myself, pratice pugil stick and Applegate style stick work, some personal bouts with some old hockey helmits/face shields and other odds and ends of safety gear to keep down on injuries. We include some sneak tactics that target the family jewels and knees starting with the stick in a normal position down beside our leg. This requires strength training and cardio for the after scuffle.
Being as fit as one can be means being able to use stratigies and tactics, other than just 'pull my gun and shoot them.' So far in the past 10 years, this has worked just fine in a couple of cases.