I want to learn acrobatics....
Anyone can learn acrobatics, it just requires determination, willpower and practice. A good role model to compare yourself and compete with is also helps a lot. I started TKD about 5 years ago. Im a black belt now, but 5 years ago when I was a white belt, there were plenty of really talented black belts who did awesome acrobatics. I was in awe, but I didnt simply wished my body could do that. After class, I would spend more than an hour bruising my body just to be able to flip and move like them. By the time I was a yellow belt, I was able to do 360 spin kicks as fast as the black belts. By the time I was a green belt, I was probably one of the fastest fighters. Fast forward to the current black belt me. I can do a 900 spin, 5 feet vertical leap without a spring(legs bent not straight 90 degrees perpendicular to the floor), 12-15 feet leap distance(again without a spring), and can do multiple blindingly quick kicks at head height. Not only that, having a goal allows you to improve. Because I'm short, 5'6 at 19 years old, I gave myself the goal to be the fastest. A lot of people, wherever I go, underestimate me because of my height when I spar, which they soon regret when they realize that all their power is useless if they cant hit me.
I'm in no way trying to brag about what I am capable of, Im just trying to convey that athletic feats(although having an athletic body helps) in my opinion is obtainable with the proper mind set, because I think that even if you're body is not athletic, you will eventually be able to be acrobatic through endless practice because slowly, without you realizing, you are developing the necessary muscles to perform the technique. Just as an infant that cant walk because of weak legs and lack of balance will eventually be able to walk as it continues to get up from falling and learning how to balance and slowly develop its leg muscles.
Acrobatics isnt easy, like I said it requires mental focus and determination and a willingness to injure your body :-\
http://www.youtube.com/watch?v=Ja_TQizb9sc Also, although you have to go past your limits to improve, you also have to know when to stop because it will all be useless if you break your body to the point of never being able to attempt anything again.
Since Kim Do was mentioned, his stuff is cool. I also like Steve Terada's movements. I dont know if he is a fighter though, but he is most definitely a top notch crowd performer.