SECRET of KI ...

In Aikido, we often hear about 'EXTEND KI' ...
And to do it we must 'KEEP ONE POINT' as The center of Ki, the sea of Chi, although i considered it as the center of gravity, the center point of human mass.

As long as i learn Aikido, there are still many questions about Ki itself.
As to the concept of Ki, the universe is full of Ki, Ki is abundant and very powerful and useful.
We live with Ki. When we drive a car, applying car insurance, riding a horse. or when we play golf at a golf course, play musics, buy property, on job, trading forex or stocks.
whoever, whatever, wherever, whenever...

What is Ki, is it just applied to whoever believe it? or to everyone?
Does Ki will be activated by meditation, chakra and kundalini practices?? is it the same thing?
or is it just mind power? is there inducing, seducing hypnosys?

I watched a video clip (here) that shown people who believed have ability in Ki manipulation.
It Looks great! amazing! people thrown or down without getting touched. like magics! or there is a secret??
However, there were sceptic persons who did not affected by the ability of Ki.
so, is it Ki or what? or Ki is equal to something that has to believed so it will work?
I still sceptical and still search the truth of Ki....

Allahumma 'qod balaghtu, FASHAD!
O Allah, i have told it, then be my Witness!

Hopefully useful,
Allahu'alam bishshowab,

sceptic aikido unisba bandung indonesia