Indirectly, yes, it makes it much easier to tap into such states.
The body wants to be in non-astral modes, prioritizing reproduction followed by survival above all else.
If you get fit, your body is basically hormonally optimized, muscles secrete and synthesize protective steroids, freeing up energy for you to focus on other things like the astral body.
The caveat is some people are so naturally attuned or well trained that they can just ignore all health stuff & achieve desirable outcomes, but this is fairly rare given the environments most people raised in.