Re: Why the extended fingers in Aikido postures
In Aikido, that seems to be the question yes? Elsewhere there may be certain reasons but in Aikido?
Well in Yoshinkan they may have one reason and in another style they may have another reason.
When studying Ki then it's for set reasons and quite opposite to the view given abt. tendons.
When doing exercises with Ki then the fingers or even one finger is used to extend Ki in a very specific direction, so it's all to do with directing Ki.
As a result the tendons bit by bit gain strength and subtleness and indeed free more and more of blocked Ki. (as in Kiatsu or acupuncture etc)
In this way of Aikido training the body does build up a 'facia' but as a result not an aim.