Bomb is correct. Realize that 95% +/- of all cadets are varsity letter athletes. Physical fitness is everything. But that needs to just be a given. You should not even be thinking about PT, Sports, physical fitness, etc... This is the Air Force Academy. Considered one of the top 10 schools in the country. In some lists, it's ranked #1-#5 in certain areas. It's also preparing you to serve as a commissioned officer in the United States Air Force. Those are the things that you should be concentrating on. If you are concerned about PT, Sports, Athletics, and Physical fitness because you aren't normally an athlete, then you have 2 big concerns. 1) Are you physically fit for the academy and 2) Are you physically fit for military life. But if you are an athlete and not some 200lb 5ft 6inch playstation junkie; then you shouldn't even worry yourself with the physical fitness part of this. Physical fitness is a given. It's like wanting to work in the medical field and wondering if you'll have to see BLOOD. If you've got such a concern, then the medical field shouldn't even be a consideration. Same with the academies and the military. If you're concerned at all about physical fitness, then maybe the academy and military aren't right for you. (Not you as in the poster; but "You" in the 3rd person anyone concerned). Physical Fitness is to the academy/military; as is Blood is to the medical fields; as is cleaning up dog poop is to a veterinarian; as is getting grease hands is to a mechanic. In other words, for those truly interested in the academy and the military other than just a free education, physical fitness is not a concern. It's a given as part of this lifestyle.
But as Bomb mentioned, even the in shape athlete can find the academy; especially at 7000 feet to be quite challenging. I know that when my son was in BCT, they do a lot of studies on how cadets adapt to the low oxygen and high altitude. Of course they need a control group. So the first thing the ask for are IC athletes and better yet, those from Colorado, Wyoming, Idaho, New Mexico, and other high altitude areas. Of course being from Wyoming, my son didn't have much of a choice. The football coach "Volunteered" him. (You'll find that out too; you GET VOLUNTEERED a lot). However, he did receive extra weekend passes for volunteering. Anyway; there's a lot of football, basketball, baseball, soccer, etc... players who get their butts kicked with the altitude. Especially those from the East/West coast areas where they are use to humidity and oxygen. Here, it's "High and Dry". Walking around, you can de-hydrate without sweating. Besides the "Cloud-Climbers" (Those from high altitude are sometimes referred to); Swimmers and Cross-Country runners seem to do well. Both of these sports really deplete oxygen and their body's have conditioned themselves to countering toxicity.
So, definitely prepare for the altitude. You should already be prepared for the physical conditioning. If you're an athlete, you are. The CFA is something different, but a good starting point. If you can't do well on the CFA or are not athletically inclined, you really need to think about the academy and military as a lifestyle. Best of luck..... Mike.....