I don't find it to be such, but you'd really have to get into a whole discussion of what we mean by "grounded". IMO it's like "closure", a buzzword that we use for some kind of vague good feeling -- in this case, for being sure and settled. But this illustrates the fact that the umbrella term "spiritual" encompasses many beliefs, including some that directly contradict each other. In order to be "grounded", to be settled and sure, you must believe that there are things or truths that do not change -- and certainly some spiritual traditions, such as Christianity, would hold that this is the case. But other traditions, such as Buddhism, believe that nothing is fixed, that everything changes -- and furthermore, that it's a bad habit to try to seek ground, to find things to cling to for surety. So, in the Buddhist view, aikido practice can't possibly help you to be grounded in yourself -- and if it lets you think so, that's a bad thing.
Thanks for your input. I was careful to set some sort of definition as to what spirituality was so we need not go down a semantic path.
In terms of Martial Arts as Buddihist Practice I would refer you to 2010 August edition of: The Middle Way, Journal of The Buddhist Society, August 2010 Vol 85. Article entitled "Martial Arts as Buddhist Practice
" by Benjamin Charlton.
What I mean when I say 'being grounded' does not mean 'seeking ground' as you seem to have defined it. Perhaps I should clarify. We could argue here about interpretations of the Dharma and the meaning of Anitya, but lets not. I am looking for common ground not a debate over doctrine, although some other time I'd love to. Comparative religion is a favourite topic of mine !
Many believe Aiki-do can serve as a valid and effective tool to understand ones own inner (true / original) nature more deeply. That is a little simplistic but by the contemporary definitions given above it qualifies.
You obviously have some strong feelings on this issue. If I were to ask you what spirituality means to you perhaps we could find some common ground?