For anyone to say what Ueshiba actually meant requires a lot of assumption (presumption).
Or it requires going to look. Bald assertions don't get anyone very far.
Related note, this one is for Chris H. From Aikido and spirituality: Japanese religious influences
in a martial art
'Tomiki Kenji, for instance, attributed Ueshiba's skill to "muscular training which is part of modern physical eductation [sic]. It's called isometrics". [Pranin (ed.), Aikido Masters
LOL. Yeah, it's just isometrics. Part of any decent physical training regimen.