Thanks for the clarification. You've got me there - I just assume that if the video is being put up, it's being claimed to be an example of 'internal force in action' - but now that you point it out, I actually haven't read any such claim being made in words. My 17 year old son, who is smaller than me and weighs a lot less than me, often pushes me over - he does it just for fun, when I stand up from the sofa. I always think - wow - how easy it is to push someone over if they're off balance. I mean - it is SO easy. Anyway - all these arguments about internal and external - thesedays I just think, well, we all enjoy what we do, nothing can be decided over the net - live and let live as my Mum used to say.
That is the right video. There is nothing, in my experience, that would allow that kind of push to achieve that kind of result. Nor does the reaction of the uke look in any way genuine to me. Still - it could just be that my lack of experience is precisely the issue. Until I actually meet someone who claims to be able to do this kind of thing, I'll never be able to say for absoloute sure... so, live and let live.
Thanks for letting me know your thoughts on the video. Personally, I don't think that what is shown in the video is real or possible - but that could just be due to my lack of experience.