If you know who Tony Jaa is then you will be nodding, and if you don't then you will be amazed. Apparently this guy grew up watching kung-fu movies believing that the flying manouvers, scaling walls etc. was real. To cut a long story short Jaa trained himself to do such physical feats without flywires and trampolines. The net result is a martial artist with freakish abilities. Oh yeah, the movie is all good by the way.