For a quick introduction on aerobatics flying, please visit this link: http://www.justflyit.org/stunt.html
It takes patience to build such a beautiful plane, but just looking at the finishing product, its all worth the effort. There are many things that can be learnt from this category, from engine tuning to building tips to spatial awareness. Each flight gives a different experience. For those who enjoy the relaxing flights while exploring creativity, this is definitely the sport for you.
Below is a video of a Bi-Slob flying. The hovering motions resembles the free moving radio control plane despite being attached to lines.
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