Somehow...the more some people deny my argument...the more I am convinced that I am correct!
Please pay attention to what Slashcuba said so succinctly, before you wish to dilute the modern meaning of Science. "Spirituality" in itself is a vague term, and can mean anything from a sense of artistic sensibility to the yogic practices which you are no doubt specifically referring to.
In the broadest spectrum of the world religions of history, you might say that the human sacrifices of the Aztecs and the Incas constituted 'spirituality' - I'm sure those ancient peoples thought they were appeasing the spirit world by slicing away at young virgins with obsidian knives.
In the Christian tradition, we know that San Juan de la Cruz was well into self-flagellation, as were the notorious flagellants of the middle-ages. Ostensibly, these practices were to imitate the sufferings of Christ, and no doubt they produced changes in consciousness. The real
science comes in when we realise that, after intense pain, the body produces endorphins which in turn induce a sense of euphoria. Added to which there is the psycho-somatic component of feeling that the participants are doing the will of God and therefore may be on the way to paradise. The latter concept perhaps explains the behaviour of that revolting 'saint' who liked to lick the sores of lepers, and lick their arseholes, claiming that such activities produced in her the most ecstatic spiritual joy. Again, true science can explain the pathology, but to claim that such 'spirituality' is 'science', I think even you would agree is stretching definitions a bit too far.
Again, there is the spirituality of the practices of Zen Buddhism, which directly contradict your own concepts, since though there are meditative techniques advocated, there is no direct or expected correlation between performing such postures etc. and the likelihood of "Satori". In fact, it is an axiom of Zen that "if you try to get 'it', it will elude you".
In short, 'spirituality' is a mixed bag. I don't doubt the Hindu tradition is replete with discliplines and systems. Why can't you be content with calling them such, instead of this neurotic need to appropriate the word "science" for them, which is neither helpful to
true science, nor to getting anyone interested in the corpus of religious experience to which you are apparently alluding.