There isn't really a specific person who discovered running. The idea of running is incredibly old. Animals run too, and they have been around longer than humans. Its not at all possible to credit one specific person or even being to the idea of running.
Yes it is. Free running is a sport
Running Free was created in 1919-02.
free running shoes
Running Free - film - was created on 2000-06-02.
Running Free - Dragon album - was created in 1977.
Anyone can do free running or become a free runner, but if you are looking for a role type; I would say an athlete.
You continue to train with free running (or parkour), your body will adjust to it and progress in it.
Yes, they could. Though it is not common to see girls perform Parkour[Free running]. Feel free to do it, but use precaution. (:
An astable multivibrator does not require an input clock, therefore can be described as "free-running" in that its running without a reference.
They mean that your running the game
leeuwenhoek first discovered the free living cell . he observed these cells with the help of primitive microscope in pond water