HOOAH!
Ok, here's the skinny (at least it was in when I went thru it - although dated since I went in 1993
)
1. I started skydiving because I wanted to go to Airborne school and I didn't want to wash out. I had 50+ jumps before I went (no, I didn't tell the blackhats that I had more jumps than some of them did); the point being that when it came time to jump out of the plane, I had no fear as I'd had previous experience. I saw a guy walk into the plane after 2 weeks of effort, and turn around and walk back out because he got scared - no way I was gonna go thru all that just to walk out of the plane! At a minimum, at least go make a tandem so you can get past the fear part.
2. While not very physical (compared to Air Assault School, anyway); you do some mild PT (if you are in shape you should have no problem); every morning of jump week you will run to the Airfield - the reason is not for PT, but for the blackhats to see who is hiding injury from the previous jumps (and there is alot of that going on). Makes sense if you can Airborne shuffle to the Airfield, then you are probably ok to jump.
3. Lastly, it's all about ATTITUDE. Play the game for 3 weeks, do what they tell you to do, when they tell you to do it, and you'll be fine. Have your crap together. The scene in Forrest Gump where he went to boot came ("whatever you tell me to do, Drill Sergeant!) is appropriate!
I had a blast, and the wings give you street cred.
Now, Air Assault (I was class leader and roster #1) was a different story.
HOOAH AIRBORNE!