Well one of the biggest growing physical sports is free running, also known as parkour
It involves one or more people who attempt to cross all obstacles they come across by using acrobatic moves, including - vaulting, jumping, sumersaults, etc. Whilst also trying to move in one smooth free flowing motion.

Free running requires heaps of skill, body control and flexibility. Lots of practice is needed to be able to learn moves and achieve big jumps, falls, etc.
There are heaps of moves to learn and ways which to mix them all together, for more info these sites are good

http://www.urbanfreeflow.com/fundamentals/fundamentals.htm
http://www.learnparkour.com/new/intro.php

Goodluck

in addition, i'd like to point out that it is very important to work on the basics when it comes to parkour. they are a little boring but you will greatly appreciate it later when the basics become natural reflexes. to be general and off the top of my head there are at least 4 basics. i'd say they are precisions, landings, judgement, and practice.

precisions
precision jumping is probably one of the most important movements of parkour. without this skill, you cant handle jumping from one point to another without stopping your momentum, an example of this is jumping from tree to tree, logs or walls. in parkour you can find yourself in some very high places, and with out precise jumping you could be in for a fatal mistake. of course the funny part of this is that making a precision landing isnt that hard its having the understanding of how far you can really jump and land with control. after all power is nothing without control.

landings
landing is by nature a result of almost all parkour movements. common landings are with both feet, rolling, and control with momentum to continue running. these are some of the most important things to practice. because without fail you will one day fall and you will need a breakfall, and done improperly can be more damaging than a plain fall.

judgment
its vital to safe practice to know your limits, without it you will make huge, painful mistakes. and through regular practice you will know and be able to expand on your abilities.

practice
as mentioned practice is paramount, its not enough to practiice once and think that you know how to do parkour. you should practice at least once a week, to suplemnt other forms of excersize, if thats not the case you should do parkour 2-3 times a week. being regular will expand your ability and build a level of comfort with extreme movements.


also its very good to train with other people, most areas have someone who you can practice parkour with. if neccessary use the internet, like your doing now. check out parkour.com and youtube.com.